.sf-menu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sf-menu li {
    position: relative;
}

.sf-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: #fff;
    padding: 0;
    margin: 0;
    list-style: none;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease;
}

.sf-menu .sub-menu li {
    width: 100%;
}

.sf-menu .sub-menu a {
    display: block;
    padding: 12px 15px;
    color: #333;
    text-decoration: none;
    background: #fff;
}

.sf-menu .sub-menu a:hover {
    background: #f5f5f5;
}

/* SHOW SUBMENU */
.sf-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
}
.sf-menu .sub-menu a:hover {
    color: #000;
}