Yes you are right. Isolved it wit the custom CSS.
It only works, when you activate the start date form by typing something words or better keywords for your SEO ;) .
This example is for an image that is used as a global placeholder. You can also use a custom image for each individual item.
Thanks Ziaul.
/ 1. Make the placeholder text invisible /
.timeline-date {
font-size: 0 !important; / Makes the text "Keywords" invisible without breaking the layout /
margin: 0;
padding: 0;
}
/ 2. Insert the PNG / Icon /
.timeline-date::before {
content: ""; / Essential for the element to be rendered /
display: inline-block;
background-image: url('https://www.yourpage.com/yourImage'); / INSERT YOUR IMAGE URL HERE /
background-size: contain;
background-repeat: no-repeat;
background-position: left top; / Aligns the icon to the left /
/* Icon size (adjust these values as needed) */
width: 140px;
height: 140px;
}