The main comic seems to be really small. And the smaller ones were showing small for me too. I'm using lemmy.world. But I was able to fix it with css. Here's the css I have now if anyone is interested:

.img-expanded:not(.banner, .avatar-overlay) {
    max-height: unset;
    max-width: 100vw;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -75px);
    outline: auto;
    outline-color: black;
    z-index: 1;
    padding: 50px;
    outline-offset: -50px;
    pointer-events: none;
}

.md-div img {
    max-height: unset;
}

/*Note: Links are exactly the same except without bg-transparent, so using not(bg-transparent) instead will outline the links instead of the expandos. Also, they're outlined orange unless you change it, so you could take that off, give them all outlines, and you can tell which they are based on the color.*/
.thumbnail.rounded.overflow-hidden.d-inline-block.position-relative.p-0.border-0.bg-transparent {
    outline: auto;
}

The small one in the middle is what I'm using to fix the shrunken images in comments problems.