.aio_icon {
    background-image: url('../images/aio/aio.png');
}

.index_head_bg {
    background-image: url('../images/aio/bg.jpg');
}

.pc {
    background-image: url('../images/aio/pc.png');
    background-size: contain;
    background-position: bottom;
}

.mobile {
    background-image: url('../images/aio/mobile.png');
    margin: 205px auto 0;
}

.feature1 {
    background-image: url('../images/aio/feature1.png');
}

.feature2 {
    background-image: url('../images/aio/feature2.png');
}

.feature3 {
    background-image: url('../images/aio/feature3.png');
}

.feature4 {
    background-image: url('../images/aio/feature4.png');
}