fix: overflow list bottom gradient on toc (closes #1888)

Jacky Zhao

2025-03-31 f70e562432ca251d4c4373dfa0b02dcde11297bc

 quartz/components/styles/backlinks.scss

@@ -1,5 +1,7 @@
@use "../../styles/variables.scss" as *;

.backlinks {
  position: relative;
  flex-direction: column;

  & > h3 {
    font-size: 1rem;