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.full-height {
    background: url("img/bak.jpg");
    background-repeat: no-repeat;
    background-position: center center;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    min-height: 100%;
    display: block;
}