.keyboard {
  display: flex;
  flex-direction: column;
}

.row {
  list-style: none;
  display: flex;
}

.keyboard li {
  height: 4em;
  width: 4em;
  color: rgba(0,0,0,0.7);
  border-radius: 0.4em;
  line-height: 4em;
  letter-spacing: 1px;
  margin: 0.4em;
  transition: 0.3s;
  text-align: center;
  font-size: 1em;
}

.keyboard #tab {
  width: 5em;
}

.keyboard #caps {
  width: 7em;
}

.keyboard #left-shift {
  width: 12em;
}

.keyboard #enter {
  width: 7em;
}

.keyboard #right-shift {
  width: 12em;
}

.keyboard #back {
  width: 5em;
}

.keyboard .pinky { 
  background-color: crimson;
  border: 2px solid crimson;
}
.keyboard .pinky.selected {
  color: crimson;
}

.keyboard .ring { 
  background-color: coral;
  border: 2px solid coral;
}
.keyboard .ring.selected {
  color: coral;
}

.keyboard .middle { 
  background-color: darkorange;
  border: 2px solid darkorange;
}
.keyboard .middle.selected {
  color: darkorange;
}

.keyboard .pointer1st { 
  background-color: gold;
  border: 2px solid gold;
}
.keyboard .pointer1st.selected {
  color: gold;
}

.keyboard .pointer2nd { 
  background-color: khaki;
  border: 2px solid khaki;
}
.keyboard .pointer2nd.selected {
  color: khaki;
}

.keyboard .fill-out-key {
  background-color: slategrey;
  border: 2px solid slategrey;
}

.keyboard .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
 * ---------------------------------------------- */

.keyboard .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);
  }
}