style.css

/* Reset styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f7f8fa, #e7ebf0);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #333;
}

.container {
  background: #ffffff;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 100%;
  max-width: 400px;
}

header h1 {
  font-size: 24px;
  color: #333;
  text-align: center;
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 14px;
  font-weight: bold;
  margin-bottom: 5px;
  color: #555;
}

input {
  padding: 12px;
  width: 100%;
  font-size: 16px;
  border-radius: 8px;
  border: 1px solid #ccc;
  margin-bottom: 20px;
  text-align: center;
  font-weight: bold;
}

.currency-selectors {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.currency-group {
  flex: 1;
}

.currency-group:not(:last-child) {
  margin-right: 10px;
}

#swapButton {
  background-color: #ffffff;
  color: #333;
  border: 1px solid #ccc;
  border-radius: 50%;
  padding: 10px;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#swapButton:hover {
  background-color: #f1f1f1;
}

select {
  padding: 12px;
  font-size: 14px;
  border-radius: 8px;
  border: 1px solid #ccc;
  width: 100%;
}

button[type="submit"] {
  padding: 12px;
  background-color: #007BFF;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  width: 100%;
}

button[type="submit"]:hover {
  background-color: #0056b3;
}

.result-box {
  margin-top: 20px;
  font-size: 16px;
  font-weight: bold;
  color: #333;
  background-color: #f8f8f8;
  padding: 15px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

footer {
  margin-top: 20px;
  font-size: 14px;
  color: #666;
  text-align: center;
}