*{
  margin: 0;
  padding: 0;
}
body{
  height: 34vw;
  width: 100vw;
  background-image: url("bg.jpg");
  background-size: 100% 100%;
  background-repeat: no-repeat;
}
.keys{
   height: 20vh;
   width: 95%;
   position: relative;
   display: flex;
   margin-top: 32vh;
   margin: 40vh auto;         
   border: 2px solid #ff0000;  
   justify-content: space-evenly; 
   text-align: center;         
}
.key{
   height: 80%;
   width: 10%;
   border: 0.3rem solid #808080;   
   border-radius: 0.5rem; 
   margin-top: 13px; 
   background-color: rgba(0, 0, 0, 0.4);           
   transition: all 0.07s ease;  
   text-shadow: 0 0 5px #000;   
}
kbd{
   display: block;  
   font-size: 4rem;                   
}
span{
   font-size: 1.7rem;
   color: #574141;     
   text-transform: uppercase;                
}
.playing{
   transform: scale(1.1);
   border-color: #ffc600;  
   box-shadow: 0 0 10px #ffc600;                   
}