title: Why is the height of my divs coming out greater than the body?
body: <p>Here is my <code>style.css</code> for a Wordpress theme based on Blankslate (I've changed none of the PHP. I just started the CSS). </p>
  
  <p>I've highlighted the elements' borders to make them visible... and all of the content is overflowing out of the <code>body</code> border. This is the CSS in its entirety:</p>
  
  <pre class="lang-css prettyprint-override"><code>/* = CSS Reset 
  -------------------------------------------------- */
  
  html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{font-size:100%;font:inherit;padding:0;border:0;margin:0;vertical-align:baseline}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:'';content:none}table{border-collapse:collapse;border-spacing:0}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}.sticky{}.bypostauthor{}.wp-caption{}.wp-caption-text{}.gallery-caption{}.alignright{}.alignleft{}.aligncenter{}
  
  
  /* =Highlight
  highlight the basic structural elements of the site
  -------------------------------------------------- */
  
  body {border: thin solid red;}
  
  #sidebar {border: thin solid blue;}
  #content {border: thin solid green;}
  
  /* =Structure
  -------------------------------------------------- */
  
  body {
      width: 1000px;
      float: center;
      margin: auto;
  }
  
  #sidebar {
      width: 300px;
      float: right;
  }
  #content {
      width: 500px;
      float: left;
  }
  </code></pre>