:root {
    --dark: hsl(199, 33%, 15%);
  }
  
  body {
    display: grid;
    place-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--dark);
  }
  
  .button {
    margin-top: 10px;
    margin-bottom: 20px;

    --bouncing-offset: 0.35em;
    --bg: 178, 60%, 48%;
  
    background-color: hsl(var(--bg));
    color: var(--dark);
  
    border: 0;
    border-radius: 0.5em;
    padding: 1em;
  
    font-size: 2rem;
    font-weight: 700;
    text-transform: uppercase;
    line-height: 1;
  
    cursor: pointer;
    box-shadow: 0 var(--bouncing-offset) 0 0 hsl(var(--bg), 0.5);
  }
  
  .button:active,
  .button:focus-visible {
    transform: translateY(var(--bouncing-offset));
    box-shadow: none;
  }

  input {
    width: 150px;
    height: 32px;
    font-size: 15px;
    border: 0;
    border-radius: 15px;
    outline: none;
    padding-left: 10px;
    background-color: rgb(233, 233, 233);
  }

/* Absolute Center Spinner */
.loading {
    position: fixed;
    z-index: 999;
    height: 2em;
    width: 2em;
    overflow: visible;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
  }
  
  /* Transparent Overlay */
  .loading:before {
    content: '';
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.3);
  }
  
  /* :not(:required) hides these rules from IE9 and below */
  .loading:not(:required) {
    /* hide "loading..." text */
    font: 0/0 a;
    color: transparent;
    text-shadow: none;
    background-color: transparent;
    border: 0;
  }
  
  .loading:not(:required):after {
    content: '';
    display: block;
    font-size: 10px;
    width: 1em;
    height: 1em;
    margin-top: -0.5em;
    -webkit-animation: spinner 1500ms infinite linear;
    -moz-animation: spinner 1500ms infinite linear;
    -ms-animation: spinner 1500ms infinite linear;
    -o-animation: spinner 1500ms infinite linear;
    animation: spinner 1500ms infinite linear;
    border-radius: 0.5em;
    -webkit-box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.5) -1.5em 0 0 0, rgba(0, 0, 0, 0.5) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
    box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) -1.5em 0 0 0, rgba(0, 0, 0, 0.75) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
  }
  
  /* Animation */
  
  @-webkit-keyframes spinner {
    0% {
      -webkit-transform: rotate(0deg);
      -moz-transform: rotate(0deg);
      -ms-transform: rotate(0deg);
      -o-transform: rotate(0deg);
      transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
      -moz-transform: rotate(360deg);
      -ms-transform: rotate(360deg);
      -o-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
  @-moz-keyframes spinner {
    0% {
      -webkit-transform: rotate(0deg);
      -moz-transform: rotate(0deg);
      -ms-transform: rotate(0deg);
      -o-transform: rotate(0deg);
      transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
      -moz-transform: rotate(360deg);
      -ms-transform: rotate(360deg);
      -o-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
  @-o-keyframes spinner {
    0% {
      -webkit-transform: rotate(0deg);
      -moz-transform: rotate(0deg);
      -ms-transform: rotate(0deg);
      -o-transform: rotate(0deg);
      transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
      -moz-transform: rotate(360deg);
      -ms-transform: rotate(360deg);
      -o-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }
  @keyframes spinner {
    0% {
      -webkit-transform: rotate(0deg);
      -moz-transform: rotate(0deg);
      -ms-transform: rotate(0deg);
      -o-transform: rotate(0deg);
      transform: rotate(0deg);
    }
    100% {
      -webkit-transform: rotate(360deg);
      -moz-transform: rotate(360deg);
      -ms-transform: rotate(360deg);
      -o-transform: rotate(360deg);
      transform: rotate(360deg);
    }
  }

  /* CSS Reset */
html {
  box-sizing: border-box;
}

*, *:before, *:after {
  box-sizing: inherit;
}

* {
  margin: 0;
  padding: 0;
}

/* (Just ignore)top banner style */
.top-banner {
  --bg: 178, 60%, 48%;
  width: 350px;
  height: 50px;
  margin-top: 50px;
  margin-bottom: 10px;
  text-align: center;
  background-color: hsl(var(--bg));
}

.top-banner a, .top-banner span {
  display: inline-block;
}

.top-banner a {
  width: 100%;
  padding: 15px 0;
  text-decoration: none;
  color: #fff;
  color: rgba(255, 255, 255, .8);
}

.top-banner span{
  width: 50px;
  height: 28px;
  line-height: 28px;
  background-color: #a1c45a;
  border-radius: 20px;
}

.top-banner a:hover {
  color: #fff9e0;
}