.banner {
    background: url("https://static1.makeuseofimages.com/wordpress/wp-content/uploads/2018/11/dark-wallpapers.jpg") no-repeat center center;
    background-size: cover;
    padding-top: 20%;
    padding-bottom: 20%;
    color: #fff;
}

.lingkaran {
    display: inline-block;
    border-radius: 50%;
    width: 150px;
    margin: auto;
    height: 150px;
    color: #fff;
    background-color: #dc3545;
}

.lingkaran i {
    position: relative;
    top: 50px;
}

.kontak {
    background: url("https://wallpaperaccess.com/full/1867010.jpg") no-repeat center center;
    background-size: cover;
    padding-bottom: 20%;
    padding-top: 20%;
    color: #fff
}