body{
  margin:0px;
  padding:0px;

}
kbd {
  display: block;
  font-size: 2em;
  font-family: 'Nanum Gothic', sans-serif;
}
span {
  font-family: 'Roboto', sans-serif;
  color:#BAFF29;
}
.banner {
  color:white;
  display:flex;
  align-items: center;
  justify-content: center;
  text-align: center;

  background-size:cover;
  background-position: center center;
  height:100vh;
}
.banner-content {
  display:flex;
  flex: 1;
  flex-direction: row;
  align-items: center;
  justify-content: center;
}

.key {
  display:flex;
  background-color:transparent;
  border: 1px solid;
  border-radius: 3px;
  border-color: black;
  padding: 10px;
  width: 60px;
  height:60px;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin:15px;
  transition: all .07s; /*to scale gradually*/
}

.clicked {
  box-shadow: 0 0 10px #BAFF29;
  border-color: #BAFF29;
  transform: scale(1.1)
}