.numberlist {
    width: auto;
}

.numberlist ol {
    list-style: none;
    font: 15px 'Trebuchet MS', 'Lucida Sans';
    padding-left: 0;
    margin-bottom: 4em;
}

.numberlist li {
    position: relative;
    margin: .5em 0;
    padding-left: 2.5em;
}

.numberlist a {
    display: block;
    padding: .4em .4em .4em .4em;
    background: #FFF;
    color: #444;
    text-decoration: none;
    border-radius: .3em;
    transition: background-color 0.3s ease;
}

.numberlist a:hover {
    background: #cbe7f8;
    text-decoration: underline;
}

.numberlist li::before {
    content: attr(data-number); /* Leest de waarde van data-number */
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    background: #f9e11e;
    height: 2em;
    width: 2em;
    line-height: 2em;
    border: .3em solid #fff;
    text-align: center;
    font-weight: bold;
    border-radius: 2em;
    color: #000000;
    overflow: hidden;
}