form {
    width: 450px;
    margin: 0 auto;
    padding: 20px;
  
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 0 10px #cccccc;
  }
  
  fieldset {
    margin-bottom: 15px;
    padding: 10px;
  
    border: 1px solid #34495e;
    border-radius: 5px;
  }
  
  fieldset legend {
    color: #34495e;
  }
  
  label {
    display: block;
    margin-bottom: 5px;
  }
  
  input,
  select,
  output,
  textarea {
    width: 95%;
    margin: 0 0 10px 0;
    padding: 2px 5px;
  
    vertical-align: middle;
  
    border: 1px solid #cccccc;
    border-radius: 5px;
  }
  
  input,
  select {
    height: 24px;
  }
  
  output {
    display: inline-block;
    width: 30px;
    height: 20px;
    margin: 0 5px 10px 0;
  
    text-align: center;
  }
  
  select[multiple] {
    height: 100px;
  }
  
  input[type="submit"],
  input[type="reset"] {
    display: inline-block;
    width: auto;
    height: auto;
    margin: 0 5px;
    padding: 6px 15px;
  
    color: #ffffff;
  
    background-color: #2c3e50;
    border: none;
    border-radius: 5px;
  }
  
  input[disabled] {
    background-color: #ebebe3;
  }
  
  .one-third-width {
    width: 33.3%;
  }
  
  .two-third-width {
    width: 66.6%;
  }
  
  .half-width {
    width: 50%;
  }
  
  .one-third-width,
  .two-third-width,
  .half-width {
    display: inline-block;
    margin-right: -4px;
  }
  
  .one-third-width input,
  .two-third-width select {
    width: 80%;
  }
  
  .half-width input,
  .half-width select {
    width: 80%;
  }
  
  .half-width input[type="range"] {
    width: 65%;
  }
  
  .output-area {
    vertical-align: top;
  }
  
  .buttons {
    margin-top: 10px;
  
    text-align: center;
  }
  
  body {
    min-width: 553px;
  }
  
  main {
    min-height: 400px;
  }