* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background-color: cornflowerblue;
}

.contenedor{
    Width:80%;
    margin:100px auto;
    display:flex;
    justify-content:center;      
    
}

.blanca{
    border: solid 2px;
    height:300px;
    background-color: white;
    width: 10%;
    border-radius: 0 0 5px 5px;
    cursor: pointer;
    min-width: 60px;
    position: relative;
}


.negra{
    border: solid 2px;
    height:200px;
    background-color: black;
    width: 5%;
    position:relative; z-index: 1;
    left: 40%; 
    border-radius: 0 0 5px 5px;
    cursor: pointer;
    min-width:40px;
}

.letraTeclablanca{
    position: absolute;
    z-index: 0;
    top: 80%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    pointer-events: none;
}

.letraTeclanegra{
    color:white;
    text-align: center;
    margin-top: 20px;
    font-size: 1.5rem;
    pointer-events: none;
}

@media screen and (max-width: 600px) {
    .blanca {
        width: 15%; 
        min-width: 30px; 
    }

    .negra {
        width: 7.5%; 
        left: 50%;  
        min-width: 20px; 
    }

  
}