body {
    background-color: black;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-weight: 500;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .title {
    color: mintcream;
    text-transform: uppercase;
    margin-top: 3em;
    margin-bottom: 3em;
    font-size: 1em;
    letter-spacing: 0.3em;
  }

  .timer{
    color:mintcream;
    margin-top: 1em;
    margin-bottom: 1em;
    font-size: 25px;
    font-weight: 500;
    letter-spacing: 4px;
  }
  
  .keyboard {
    display: flex;
    flex-direction: column;
  }
  
  .row {
    list-style: none;
    display: flex;
  }
  
  li {
    height: 3em;
    width: 3em;
    color: rgba(0,0,0,0.7);
    border-radius: 0.4em;
    line-height: 3em;
    letter-spacing: 1px;
    margin: 0.4em;
    transition: 0.3s;
    text-align: center;
    font-size: 1em;
  }
  
  #tab {
    width: 5em;
  }
  
  #caps {
    width: 6em;
  }
  
  #left-shift {
    width: 8em;
  }
  
  #enter {
    width: 6em;
  }
  
  #right-shift {
    width: 8em;
  }
  
  #back {
    width: 5em;
  }
  
  .pinky { 
    background-color: crimson;
    border: 2px solid crimson;
  }
  .pinky.selected {
    color: crimson;
  }
  
  .ring { 
    background-color: coral;
    border: 2px solid coral;
  }
  .ring.selected {
    color: coral;
  }
  
  .middle { 
    background-color: darkorange;
    border: 2px solid darkorange;
  }
  .middle.selected {
    color: darkorange;
  }
  
  .pointer1st { 
    background-color: gold;
    border: 2px solid gold;
  }
  .pointer1st.selected {
    color: gold;
  }
  
  .pointer2nd { 
    background-color: khaki;
    border: 2px solid khaki;
  }
  .pointer2nd.selected {
    color: khaki;
  }
  
  .fill-out-key {
    background-color: slategrey;
    border: 2px solid slategrey;
  }
  
  .selected {
    background-color: transparent;
      -webkit-animation: vibrate-1 0.3s linear infinite both;
            animation: vibrate-1 0.3s linear infinite both;
  }
  
  /* ----------------------------------------------
   * Generated by Animista
   * Licensed under FreeBSD License.
   * See http://animista.net/license for more info. 
   * w: http://animista.net, t: @cssanimista
   * ---------------------------------------------- */
  
  .hit {
    -webkit-animation: hit 0.3s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
            animation: hit 0.3s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
  }
  
  @-webkit-keyframes hit {
    0% {
      -webkit-transform: scale(1.2);
              transform: scale(1.2);
    }
    100% {
      -webkit-transform: scale(1);
              transform: scale(1);
    }
  }
  @keyframes hit {
    0% {
      -webkit-transform: scale(1.2);
              transform: scale(1.2);
    }
    100% {
      -webkit-transform: scale(1);
              transform: scale(1);
    }
  }
  
  @-webkit-keyframes vibrate-1 {
    0% {
      -webkit-transform: translate(0);
              transform: translate(0);
    }
    20% {
      -webkit-transform: translate(-2px, 2px);
              transform: translate(-2px, 2px);
    }
    40% {
      -webkit-transform: translate(-2px, -2px);
              transform: translate(-2px, -2px);
    }
    60% {
      -webkit-transform: translate(2px, 2px);
              transform: translate(2px, 2px);
    }
    80% {
      -webkit-transform: translate(2px, -2px);
              transform: translate(2px, -2px);
    }
    100% {
      -webkit-transform: translate(0);
              transform: translate(0);
    }
  }
  @keyframes vibrate-1 {
    0% {
      -webkit-transform: translate(0);
              transform: translate(0);
    }
    20% {
      -webkit-transform: translate(-2px, 2px);
              transform: translate(-2px, 2px);
    }
    40% {
      -webkit-transform: translate(-2px, -2px);
              transform: translate(-2px, -2px);
    }
    60% {
      -webkit-transform: translate(2px, 2px);
              transform: translate(2px, 2px);
    }
    80% {
      -webkit-transform: translate(2px, -2px);
              transform: translate(2px, -2px);
    }
    100% {
      -webkit-transform: translate(0);
              transform: translate(0);
    }
  }

  /* ------------for button----------------------------- */
  
.btn{
  margin-top: 50px;
  padding-left: 60px;
  text-align: center;
  display: flex;
  justify-content: space-between;
}
.button {
  align-items: center;
  appearance: none;
  margin-right: 30px;
  background-color: #FCFCFD;
  border-radius: 4px;
  border-width: 0;
  box-shadow: rgba(45, 35, 66, 0.4) 0 2px 4px,rgba(45, 35, 66, 0.3) 0 7px 13px -3px,#D6D6E7 0 -3px 0 inset;
  box-sizing: border-box;
  color: #36395A;
  cursor: pointer;
  display: inline-flex;
  font-family: "JetBrains Mono",monospace;
  height: 48px;
  justify-content: center;
  line-height: 1;
  list-style: none;
  overflow: hidden;
  padding-left: 16px;
  padding-right: 16px;
  position: relative;
  text-align: left;
  text-decoration: none;
  transition: box-shadow .15s,transform .15s;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  white-space: nowrap;
  will-change: box-shadow,transform;
  font-size: 18px;
}

.button:focus {
  box-shadow: #D6D6E7 0 0 0 1.5px inset, rgba(45, 35, 66, 0.4) 0 2px 4px, rgba(45, 35, 66, 0.3) 0 7px 13px -3px, #D6D6E7 0 -3px 0 inset;
}

.button:hover {
  box-shadow: rgba(45, 35, 66, 0.4) 0 4px 8px, rgba(45, 35, 66, 0.3) 0 7px 13px -3px, #D6D6E7 0 -3px 0 inset;
  transform: translateY(-2px);
}

.button:active {
  box-shadow: #D6D6E7 0 3px 7px inset;
  transform: translateY(2px);
}