.menu-content {
    position: fixed;
    top: 76px !important;
}

.api-content {
    margin-left: 260px;
}

.api-content > div::after {
    position: absolute;
    bottom: 0px;
    width: 100%;
    display: block;
    content: "";
    border-bottom: 1px solid rgba(0, 0, 0, 0.2);
}