isso.css: Set width & height to 100% for isso-avatar svg
.isso-comment > .isso-avatar > svg {
max-width: 48px;
max-height: 48px;
+ width: 100%;
+ height: 100%;
border: 1px solid rgba(0, 0, 0, 0.2);
border-radius: 3px;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
