.ziehharmonika h3 {
    background: rgba(255, 255, 255, 0);
    color: #2d2d2d;
    text-align: left;
    font-size: 1.5em;
    padding: 25px 60px 25px 20px;
    cursor: pointer;
    margin-top: 0;
    margin-bottom: 25px;
    transition: .25s all;
    position: relative;
    border: 2px solid #666565;
    font-weight: 700;
    letter-spacing: 1px;
    border-radius: 10px;
    width: 50%;
}

.ziehharmonika h3.active {
    margin-bottom: 21px;
    background: #0f303f;
    border: 6px solid rgba(44, 185, 139, .01);
    color: #fff;
}

.ziehharmonika h3::before {
    content: attr(data-prefix);
    font-size: 10px;
    margin-right: 9px
}

.ziehharmonika>div {
    display: none;
    background: #fff;
    border-radius: 0;
    border: 1px solid #cdcdcd;
    text-align: left;
    padding: 31px 33px;
    margin-bottom: 9px;
    width: 50%;
}

.ziehharmonika .arrowDown {
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 13px 7.5px 0;
    border-color: #272e35 transparent transparent;
    position: absolute;
    bottom: 0;
    left: 40px;
    transition: .25s all;
    opacity: 0
}

.ziehharmonika .active .arrowDown {
    bottom: -18px;
    border-color: #0f303f transparent transparent;
    opacity: 1
}

.ziehharmonika .collapseIcon {
    position: absolute;
    right: 20px;
    top: 52%;
    font-size: 30px;
    font-weight: 400;
    -ms-transform: translate(0, -50%);
    transform: translate(0, -50%)
}

@media(max-width: 768px){
    .ziehharmonika h3 {
        padding: 15px 20px;
        width: 100%;
    }
 .ziehharmonika>div{
 width: 100%;
}
}
@media(max-width:640px) {
    .ziehharmonika>div {
        display: none;
        background: #fff;
        border-radius: 0;
        border: 1px solid #cdcdcd;
        text-align: left;
        padding: 15px;
        margin-bottom: 9px;
        
    }

    .ziehharmonika h3 {
        padding: 15px 20px
    }
}

@media(max-width:414px) {
    .ziehharmonika h3 {
        padding: 9px 40px 9px 15px;
        margin-bottom: 14px;
        font-size: 1.2em;
        
    }
}