body {
    margin: 20px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
      Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", Helvetica, Arial,
      sans-serif;
  }
  
  /* fallback, until https://github.com/CompuIves/codesandbox-client/issues/174 is resolved */
  @font-face {
    font-family: "Material Icons";
    font-style: normal;
    font-weight: 400;
    src: url(https://fonts.gstatic.com/s/materialicons/v36/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2)
      format("woff2");
  }
  
  .material-icons {
    font-family: "Material Icons";
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: "liga";
    -webkit-font-smoothing: antialiased;
  }
  
  /* mdl-demo is a custom classname to increases the specificity of our styles. It can be anything. 
   * The idea is that it is easy to extend/override builtin styles with very little effort.
   */
  
  .mdl-demo .dropdown-trigger > span:after {
    font-size: 12px;
    color: #555;
  }
  
  .mdl-demo .toggle {
    font: normal normal normal 18px/1 "Material Icons";
    color: #555;
    white-space: pre;
    margin-right: 4px;
  }
  
  .mdl-demo .toggle.collapsed::after {
    cursor: pointer;
    content: "\E5CF";
    vertical-align: middle;
  }
  
  .mdl-demo .toggle.expanded::after {
    cursor: pointer;
    content: "\E5CE";
    vertical-align: middle;
  }
  
  /* checkbox styles */
  .mdl-demo .checkbox-item {
    position: relative;
    width: 1rem;
    height: 1rem;
    margin-right: 0.75rem;
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    outline: 0;
    vertical-align: middle;
  }
  
  .mdl-demo .checkbox-item:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1;
    width: 100%;
    height: 100%;
    border: 2px solid #aaa;
    transition: all 0.3s ease-in-out;
  }
  
  .mdl-demo .checkbox-item:checked:before {
    height: 50%;
    -webkit-transform: rotate(-45deg);
    transform: rotate(-45deg);
    border-top-style: none;
    border-right-style: none;
    border-color: #2196f3;
  }
  