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

body {
    background-color: green;
}

.custom-box {
    background-color: #fff;
    width: 600px;
    height: 200px;
    border-radius: 10px;
    margin: 100px auto;
}

.custom-box h3 {
    margin-bottom: 8px;
    margin-left: 20px; 
    padding-top: 20px;
}

.info {
    margin-left: 20px;
}

.custom-box button {
    padding: 13px;
    background: green;
    border-radius: 5px;
    color: #fff;
    border: none;
    margin-top: 20px;
    width: 150px;
}

.butt {
    margin-left: 20px;
}

.butt button:hover {
    background-color: black;
    cursor: cell;
}

@media screen and (min-width: 320px) and (max-width: 600px) {
    .custom-box {
        background-color: #fff;
        width: 300px;
        height: 235px;
        border-radius: 10px;
        margin: 100px auto;
        margin-top: 60%;
    }
}