.header-bottom:before {
    content: '';
    background: url(../img/img-garland.png) repeat-x left;
    width: 100%;
    height: 15px;
    position: absolute;
    top: calc(100%);
    left: 0;
}

.header-top:before {
    content: '';
    background: url(../img/img-garland.png) no-repeat center;
    width: 1920px;
    height: 15px;
    position: absolute;
    top: calc(100%)
}