.bxslider div {
    min-height: 100vh;
}

.bx-wrapper {
    border: 0;
}
    
.bxslider div.one {
    background: url(../images/main-image.jpg) center center;
    background-size: cover;
}

.bxslider div.two {
    background: url(https://images.unsplash.com/photo-1464822759023-fed622ff2c3b?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&s=61282cfeed75871385c84c2a44a8e594) center center;
    background-size: cover;
}

.bxslider div.three {
    background: url(../images/main-image.jpg) center center;
    background-size: cover;
}