.arrow_down {
    margin-left: 20px;
    margin-bottom: 2px;
    display: inline-block;
    width: 10px;
    height: 10px;
    border-bottom: 2px solid white;
    border-left: 2px solid white;
    transform: rotate(-45deg);
    transition: all 0.3s ease-in-out;
    cursor: pointer;
}

.sidebar_headline.active .arrow_down {
    transform: rotate(134deg) translate(5px, -5px);
}

.sidebar_headline {
    border-bottom: none !important;
    cursor: pointer;
    display: block;
    margin: 10px 0px;

}

.sidebar_itemcontainer {
    border-bottom: none;
    margin-bottom: 0px;
    flex-flow: row wrap;
    justify-content: flex-start;
    align-items: flex-start;

}


.sidebar_menuitem {
    border: 1px solid white;
    padding: 7px 12px;
    font-size: 16px;
    margin-right: 15px;
    margin-bottom: 15px;
    transition: all 0.2s;
    display: inline-block;
}

.sidebar_menuitem:hover {
    color: black;
    background: white;
    text-decoration: none;
}