.head-border {
    position: relative;
    display: inline-block;
    padding: 0 55px;
}

.head-border:before,
.head-border:after {
    content: '';
    position: absolute;
    top: 50%;
    display: inline-block;
    width: 50px;
    height: 5px;
    background-color: #666;
}

.head-border:before {
    left: 0;
}

.head-border:after {
    right: 0;
}