The default quote button in the #littleFedi web UI looks to me like the number "55", which distracts me ("Hey, another post got 55 boosts!") so I added some custom CSS. It's a testament to littleFedi that I haven't wanted to add any customCSS until now.

/* Hide the original quote SVG */
.action-btn[title="Quote"] svg {
display: none;
}

/* Replace with nicer one */
.action-btn[title="Quote"]::before {
content: "\201C";
font-family: Georgia, serif;
font-size: 26px;
font-weight: bold;
line-height: 1;
position: relative;
top: 4px;
}