/* Button */
button {
    -webkit-appearance: none;
    font-size: 16px;
    border: none;
}
button.rund {
    background: #04c;
    border: 3px solid #fff;
    border-radius: 30px;
    box-shadow: 0 0 2px #000;
    color: #fff;
    width: 40px;
    height: 40px;
    font-weight: bold;
    font-size: 30px;
    line-height: 18px;
    padding: 0;
    text-align: center;
}
button.aktualisieren {
    position: absolute;
    top: 10px;
    right: 10px;
}