.addons-heading-title.show-line-yes:after {
    content: "";
    width: 100%;
    background-color: #fee444;
    position: absolute;
    bottom: 0;
    left: 0;
    height: 7px;
    z-index: -1;
}

.addons-heading-title.show-line-yes {
    position: relative;
    display: inline-block;
    z-index: 1;
}