.bg_1 {
    background-image: url('imgs/index_bga.jpg');
}

.bg_2 {
    background-image: url('imgs/index_bgb.jpg');
}

.bg_3 {
    background-image: url('imgs/index_bgc.jpg');
}

.header {
    background-color: #4A5B79;
}

.footer {
    background-color: #4A5B79;
}