title: how i can connect and login in mysql localhost in php by using this html code
body: <p>how i can connect with database by using this code and how i can login for student and redirect to the student panel please write down
  the php login code</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>body {
   background: #DCDDDF url(http://cssdeck.com/uploads/media/items/7/7AF2Qzt.png);
   color: #000;
   font: 14px Arial;
   margin: 0 auto;
   padding: 0;
   position: relative;
  }
  h1{ font-size:28px;}
  h2{ font-size:26px;}
  h3{ font-size:18px;}
  h4{ font-size:16px;}
  h5{ font-size:14px;}
  h6{ font-size:12px;}
  h1,h2,h3,h4,h5,h6{ color:#563D64;}
  small{ font-size:10px;}
  b, strong{ font-weight:bold;}
  a{ text-decoration: none; }
  a:hover{ text-decoration: underline; }
  .left { float:left; }
  .right { float:right; }
  .alignleft { float: left; margin-right: 15px; }
  .alignright { float: right; margin-left: 15px; }
  .clearfix:after,
  form:after {
   content: ".";
   display: block;
   height: 0;
   clear: both;
   visibility: hidden;
  }
  .container { margin: 25px auto; position: relative; width: 900px; }
  #content {
   background: #f9f9f9;
   background: -moz-linear-gradient(top,  rgba(248,248,248,1) 0%, rgba(249,249,249,1) 100%);
   background: -webkit-linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   background: -o-linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   background: -ms-linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   background: linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f8f8f8', endColorstr='#f9f9f9',GradientType=0 );
   -webkit-box-shadow: 0 1px 0 #fff inset;
   -moz-box-shadow: 0 1px 0 #fff inset;
   -ms-box-shadow: 0 1px 0 #fff inset;
   -o-box-shadow: 0 1px 0 #fff inset;
   box-shadow: 0 1px 0 #fff inset;
   border: 1px solid #c4c6ca;
   margin: 0 auto;
   padding: 25px 0 0;
   position: relative;
   text-align: center;
   text-shadow: 0 1px 0 #fff;
   width: 400px;
  }
  #content h1 {
   color: #7E7E7E;
   font: bold 25px Helvetica, Arial, sans-serif;
   letter-spacing: -0.05em;
   line-height: 20px;
   margin: 10px 0 30px;
  }
  #content h1:before,
  #content h1:after {
   content: "";
   height: 1px;
   position: absolute;
   top: 10px;
   width: 27%;
  }
  #content h1:after {
   background: rgb(126,126,126);
   background: -moz-linear-gradient(left,  rgba(126,126,126,1) 0%, rgba(255,255,255,1) 100%);
   background: -webkit-linear-gradient(left,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
   background: -o-linear-gradient(left,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
   background: -ms-linear-gradient(left,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
   background: linear-gradient(left,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
      right: 0;
  }
  #content h1:before {
   background: rgb(126,126,126);
   background: -moz-linear-gradient(right,  rgba(126,126,126,1) 0%, rgba(255,255,255,1) 100%);
   background: -webkit-linear-gradient(right,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
   background: -o-linear-gradient(right,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
   background: -ms-linear-gradient(right,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
   background: linear-gradient(right,  rgba(126,126,126,1) 0%,rgba(255,255,255,1) 100%);
      left: 0;
  }
  #content:after,
  #content:before {
   background: #f9f9f9;
   background: -moz-linear-gradient(top,  rgba(248,248,248,1) 0%, rgba(249,249,249,1) 100%);
   background: -webkit-linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   background: -o-linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   background: -ms-linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   background: linear-gradient(top,  rgba(248,248,248,1) 0%,rgba(249,249,249,1) 100%);
   filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f8f8f8', endColorstr='#f9f9f9',GradientType=0 );
   border: 1px solid #c4c6ca;
   content: "";
   display: block;
   height: 100%;
   left: -1px;
   position: absolute;
   width: 100%;
  }
  #content:after {
   -webkit-transform: rotate(2deg);
   -moz-transform: rotate(2deg);
   -ms-transform: rotate(2deg);
   -o-transform: rotate(2deg);
   transform: rotate(2deg);
   top: 0;
   z-index: -1;
  }
  #content:before {
   -webkit-transform: rotate(-3deg);
   -moz-transform: rotate(-3deg);
   -ms-transform: rotate(-3deg);
   -o-transform: rotate(-3deg);
   transform: rotate(-3deg);
   top: 0;
   z-index: -2;
  }
  #content form { margin: 0 20px; position: relative }
  #content form input[type="text"],
  #content form input[type="password"] {
   -webkit-border-radius: 3px;
   -moz-border-radius: 3px;
   -ms-border-radius: 3px;
   -o-border-radius: 3px;
   border-radius: 3px;
   -webkit-box-shadow: 0 1px 0 #fff, 0 -2px 5px rgba(0,0,0,0.08) inset;
   -moz-box-shadow: 0 1px 0 #fff, 0 -2px 5px rgba(0,0,0,0.08) inset;
   -ms-box-shadow: 0 1px 0 #fff, 0 -2px 5px rgba(0,0,0,0.08) inset;
   -o-box-shadow: 0 1px 0 #fff, 0 -2px 5px rgba(0,0,0,0.08) inset;
   box-shadow: 0 1px 0 #fff, 0 -2px 5px rgba(0,0,0,0.08) inset;
   -webkit-transition: all 0.5s ease;
   -moz-transition: all 0.5s ease;
   -ms-transition: all 0.5s ease;
   -o-transition: all 0.5s ease;
   transition: all 0.5s ease;
   background: #eae7e7 url(http://cssdeck.com/uploads/media/items/8/8bcLQqF.png) no-repeat;
   border: 1px solid #c8c8c8;
   color: #777;
   font: 13px Helvetica, Arial, sans-serif;
   margin: 0 0 10px;
   padding: 15px 10px 15px 40px;
   width: 80%;
  }
  #content form input[type="text"]:focus,
  #content form input[type="password"]:focus {
   -webkit-box-shadow: 0 0 2px #ed1c24 inset;
   -moz-box-shadow: 0 0 2px #ed1c24 inset;
   -ms-box-shadow: 0 0 2px #ed1c24 inset;
   -o-box-shadow: 0 0 2px #ed1c24 inset;
   box-shadow: 0 0 2px #ed1c24 inset;
   background-color: #fff;
   border: 1px solid #ed1c24;
   outline: none;
  }
  #username { background-position: 10px 10px !important }
  #password { background-position: 10px -53px !important }
  #content form input[type="submit"] {
   background: rgb(254,231,154);
   background: -moz-linear-gradient(top,  rgba(254,231,154,1) 0%, rgba(254,193,81,1) 100%);
   background: -webkit-linear-gradient(top,  rgba(254,231,154,1) 0%,rgba(254,193,81,1) 100%);
   background: -o-linear-gradient(top,  rgba(254,231,154,1) 0%,rgba(254,193,81,1) 100%);
   background: -ms-linear-gradient(top,  rgba(254,231,154,1) 0%,rgba(254,193,81,1) 100%);
   background: linear-gradient(top,  rgba(254,231,154,1) 0%,rgba(254,193,81,1) 100%);
   filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fee79a', endColorstr='#fec151',GradientType=0 );
   -webkit-border-radius: 30px;
   -moz-border-radius: 30px;
   -ms-border-radius: 30px;
   -o-border-radius: 30px;
   border-radius: 30px;
   -webkit-box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
   -moz-box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
   -ms-box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
   -o-box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
   box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
   border: 1px solid #D69E31;
   color: #85592e;
   cursor: pointer;
   float: left;
   font: bold 15px Helvetica, Arial, sans-serif;
   height: 35px;
   margin: 20px 0 35px 15px;
   position: relative;
   text-shadow: 0 1px 0 rgba(255,255,255,0.5);
   width: 120px;
  }
  #content form input[type="submit"]:hover {
   background: rgb(254,193,81);
   background: -moz-linear-gradient(top,  rgba(254,193,81,1) 0%, rgba(254,231,154,1) 100%);
   background: -webkit-linear-gradient(top,  rgba(254,193,81,1) 0%,rgba(254,231,154,1) 100%);
   background: -o-linear-gradient(top,  rgba(254,193,81,1) 0%,rgba(254,231,154,1) 100%);
   background: -ms-linear-gradient(top,  rgba(254,193,81,1) 0%,rgba(254,231,154,1) 100%);
   background: linear-gradient(top,  rgba(254,193,81,1) 0%,rgba(254,231,154,1) 100%);
   filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fec151', endColorstr='#fee79a',GradientType=0 );
  }
  #content form div a {
   color: #004a80;
      float: right;
      font-size: 12px;
      margin: 30px 15px 0 0;
      text-decoration: underline;
  }
  .button {
   background: rgb(247,249,250);
   background: -moz-linear-gradient(top,  rgba(247,249,250,1) 0%, rgba(240,240,240,1) 100%);
   background: -webkit-linear-gradient(top,  rgba(247,249,250,1) 0%,rgba(240,240,240,1) 100%);
   background: -o-linear-gradient(top,  rgba(247,249,250,1) 0%,rgba(240,240,240,1) 100%);
   background: -ms-linear-gradient(top,  rgba(247,249,250,1) 0%,rgba(240,240,240,1) 100%);
   background: linear-gradient(top,  rgba(247,249,250,1) 0%,rgba(240,240,240,1) 100%);
   filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f7f9fa', endColorstr='#f0f0f0',GradientType=0 );
   -webkit-box-shadow: 0 1px 2px rgba(0,0,0,0.1) inset;
   -moz-box-shadow: 0 1px 2px rgba(0,0,0,0.1) inset;
   -ms-box-shadow: 0 1px 2px rgba(0,0,0,0.1) inset;
   -o-box-shadow: 0 1px 2px rgba(0,0,0,0.1) inset;
   box-shadow: 0 1px 2px rgba(0,0,0,0.1) inset;
   -webkit-border-radius: 0 0 5px 5px;
   -moz-border-radius: 0 0 5px 5px;
   -o-border-radius: 0 0 5px 5px;
   -ms-border-radius: 0 0 5px 5px;
   border-radius: 0 0 5px 5px;
   border-top: 1px solid #CFD5D9;
   padding: 15px 0;
  }
  .button a {
   background: url(http://cssdeck.com/uploads/media/items/8/8bcLQqF.png) 0 -112px no-repeat;
   color: #7E7E7E;
   font-size: 17px;
   padding: 2px 0 2px 40px;
   text-decoration: none;
   -webkit-transition: all 0.3s ease;
   -moz-transition: all 0.3s ease;
   -ms-transition: all 0.3s ease;
   -o-transition: all 0.3s ease;
   transition: all 0.3s ease;
  }
  .button a:hover {
   background-position: 0 -135px;
   color: #00aeef;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html &gt;
    &lt;head&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;title&gt;Online Student Service Center&lt;/title&gt;
      
          &lt;link rel="stylesheet" href="style.css"&gt;
      
    &lt;/head&gt;
  
    &lt;body&gt;
  
      &lt;body&gt;
  &lt;div class="container"&gt;
   &lt;section id="content"&gt;
    &lt;form action="php/login.php" method="POST" &gt;
     &lt;h1&gt;Login Form&lt;/h1&gt;
     &lt;div&gt;
      &lt;input type="text" placeholder="Student ID" required="" id="username" /&gt;
     &lt;/div&gt;
     &lt;div&gt;
      &lt;input type="password" placeholder="Password" required="" id="password" /&gt;
     &lt;/div&gt;
     &lt;div&gt;
      &lt;input type="submit" value="Log in" /&gt;
      &lt;a href="#"&gt;Lost your password?&lt;/a&gt;
      &lt;a href="#"&gt;Register&lt;/a&gt;
     &lt;/div&gt;
    &lt;/form&gt;&lt;!-- form --&gt;
    &lt;div class="button"&gt;
     &lt;a href="admin.html"&gt;Admin&lt;/a&gt;
    &lt;/div&gt;&lt;!-- button --&gt;
    
   &lt;div class="button"&gt;
  &lt;a href="teacher.html"&gt;Teacher&lt;/a&gt;
  &lt;/div&gt;&lt;!-- button --&gt;
  
   &lt;/section&gt;&lt;!-- content --&gt;
  &lt;/div&gt;&lt;!-- container --&gt;
  &lt;/body&gt;
  
    &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>please also tell me that how i can fetch data from database</p>