Meta Post - Common CSS Hacks

@OlivierPS: you could try this:

/*============bigger link popup preview  ================*/
.popover.hover-popover {
    position: absolute;
    z-index: var(--layer-popover);
    transform: scale(0.9); /* makes the content smaller */
    max-height: 800px;    /* was 300 */
    min-height: 100px;
    width: 500px; /* was 400 */
    overflow: hidden;      
    padding: 0;
    border-bottom: none;
  }
/* I'm not sure what this does, got popove code from Obsdn-Dark-Rmx */
/*
  .popover {
    background-color: var(--background-primary);
    border: 1px solid var(--background-primary-alt);
    box-shadow: 3px 3px 7px var(--background-modifier-box-shadow);
    border-radius: 6px;
    padding: 15px 20px 10px 20px;
    position: relative;
}

There are plenty more other tweaks where this comes from.