*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    font-family: Arial, sans-serif;
    background-color: #ffffff;
}

.canvas{
    width: 100%;
    max-width: 600px;
    margin: 40px auto;
    text-align: center;
    padding: 20px;
}

.canvas h1{
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 30px;
}

.color-boxes{
    display: grid;
    grid-template-columns: repeat(3, 120px);
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
}

.button{
    width: 120px;
    height: 120px;
    border: 3px solid #333;
}

#grey{
    background-color: gray;
}

#white{
    background-color: #ffffff;
}

#blue{
    background-color: #1d4ed8;
}

#yellow{
    background-color: #eab308;
    grid-column: 2/3;
}

.canvas h2{
    font-size: 2rem;
    font-weight: bold;
    line-height: 1.3;
}

/* Responsive */
@media (max-width: 600px){
    .canvas h1 {
        font-size: 1.5rem;
    }

    .color-boxes{
        grid-template-columns: repeat(3, 90px);
        gap: 8px;
    }

    .button{
        width: 90px;
        height: 90px;
    }

    .canvas h2{
        font-size: 1.4rem;
    }

}

@media (max-width: 400px){
    .color-boxes{
        grid-template-columns: repeat(3, 70px);
    }

    .button{
        width: 70px;
        height: 70px;
    }

    .canvas h2{
        font-size: 1.1rem;
    }
}