body{
    background: radial-gradient(black , grey);
    margin: 0;
    padding: 0;
}

div{
    border: solid black 2px;
    width: 90%;
    max-width: 400px;
    height: 400px;
    margin: 100px auto;
    padding-left: 40px;
    padding-right: 30px;
    background-color: grey;
    color: white;
}

button{
    padding-left: 100px;
    padding-right: 100px;
    padding-top: 10px;
    padding-bottom: 10px;
    background-color: white;
    box-shadow: black;
    margin-left: 70px;
    margin-top: 200px;
}

h1{
    margin-top: 40px;
}

button:hover{
    cursor: pointer;
    background-color: blue;
    transform: scale(1.10);
}

@media (max-width: 768px) {
    div {
        width: 90%;
        height: auto;
    }
    
    button {
        margin-left: 20%;
        margin-top: 150px;
    }
}

@media (max-width: 480px) {
    div {
        width: 100%;
        padding-left: 20px;
        padding-right: 20px;
    }

    h1 {
        font-size: 24px;
    }

    button {
        padding-left: 60px;
        padding-right: 60px;
        margin-left: 10%;
        margin-top: 150px;
    }
}