.dark{background:#333;padding:50px;}
.dark2{padding:10px;}
.dark h2{color:#fff;} .dark p{color:#ccc} .dark h4{color:#a2d30a}
.white{background:#fff;padding:50px;}
.gray{background:#f1f1f1;padding:50px;}
.white h2{color:#333;} .white p{color:#333} .white h4{color:#5a6b27}

button{background:white; padding:5px;color:black}

@media(max-width:991px) {
    .dark{padding:20px;}
    .white{padding:20px;}
    .gray{padding:20px;}
}