.rodelijn {
    pointer-events: none;
}
.bekijk-foto-driehoek {
    display: block;
    width: 200px;
    aspect-ratio: 1/1;
    position: absolute;
    right: 18%;
    top: 0;
    background: #3d54a9;
    clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 0%);            
}

a.bekijk-foto-driehoek::after {
    content: attr(data-linktext) "\astaan online!";
    color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(45deg) translateX(52%);
    text-align: center;
    font-size: 20px;
    white-space: pre;
    line-height: 1.1;
    text-transform: uppercase;
}