.menu {
    float: left;
    width: 15%; 
    height: 100vh;
    border: none; 
    background-color: rgba(173, 216, 230, 1);
    box-sizing: border-box;
    
    box-shadow: 12px 0 15px -10px rgba(0, 0, 0, 0.7); 
    
    position: relative; 
    z-index: 10; 
}

.contenuto {
    float: left; 
    width: 85%; 
    height: 100vh; 
    border: 0; 
    background-color: transparent;
    box-sizing: border-box;
}

/* Media query per tablet */
@media screen and (max-width: 1024px) {
    .menu {
        width: 20%;
    }
    
    .contenuto {
        width: 80%;
    }
}

@media screen and (max-width: 768px) {
    .menu {
        float: none;
        width: 100%;
        height: auto;
        min-height: 60px;
        
        box-shadow: 0 12px 15px -10px rgba(0, 0, 0, 0.2); 
    }
    
    .contenuto {
        float: none;
        width: 100%;
        height: calc(100vh - 60px);
    }
}

@media screen and (max-width: 480px) {
    .menu {
        min-height: 50px;
    }
    
    .contenuto {
        height: calc(100vh - 50px);
    }
}