radare/radare2-webui

.ui-menu {
    list-style: none;
    padding: 0;
    /*margin: 50px 50px;*/
    display: block;
    outline: none;
    background: #c0c0c0;
    width: 200px;
    border: 1px solid #AAA;
    color: #222;
    z-index: 100;
}


.ui-menu .ui-menu {
    position: absolute;

}
.ui-menu .ui-menu-item {
    font-family: monospace;
    position: relative;
    margin: 0;
    padding: 3px 1em 3px .4em;
    cursor: pointer;
    min-height: 0; /* support: IE7 */
}
.ui-menu .ui-menu-item:hover {
    font-family: monospace;
    position: relative;
    margin: 0;
    background: yellow;
    padding: 3px 1em 3px .4em;
    cursor: pointer;
    min-height: 0; /* support: IE7 */
}

.ui-menu .ui-menu-item a {
    color: #555555;
    text-decoration: none;
    outline: none;
}

.ui-menu .ui-menu-item a:visited {
    color: #555555;
    text-decoration: none;
    outline: none;
}

.ui-menu .ui-menu-divider {
    margin: 5px 0;
    height: 0;
    font-size: 0;
    line-height: 0;
    border-width: 1px 0 0 0;
}
.ui-menu .ui-state-focus,
.ui-menu .ui-state-active {
    margin: -1px;
}

.ui-menu kbd {
    padding-left: 1em;
    float: right;
}