style: improve code style of SCSS & YAML

_sass/layout/archives.scss

@@ -8,7 +8,7 @@
   $timeline-width: 4px;
 
   %timeline {
-    content: "";
+    content: '';
     width: $timeline-width;
     position: relative;
     float: left;
@@ -37,8 +37,9 @@
       top: 24px;
     }
 
-    &::after { /* Year dot */
-      content: "";
+    /* Year dot */
+    &::after {
+      content: '';
       display: inline-block;
       position: relative;
       border-radius: 50%;
@@ -63,7 +64,14 @@
 
       &:nth-child(odd) {
         background-color: var(--main-bg, #ffffff);
-        background-image: linear-gradient(to left, #ffffff, #fbfbfb, #fbfbfb, #fbfbfb, #ffffff);
+        background-image: linear-gradient(
+          to left,
+          #ffffff,
+          #fbfbfb,
+          #fbfbfb,
+          #fbfbfb,
+          #ffffff
+        );
       }
 
       &::before {
@@ -109,7 +117,7 @@
 
     &::before {
       /* the dot before post title */
-      content: "";
+      content: '';
       display: inline-block;
       position: relative;
       border-radius: 50%;

_sass/layout/categories.scss

@@ -54,7 +54,8 @@
   }
 }
 
-@media (hover: hover) { /* only works on desktop */
+/* only works on desktop */
+@media (hover: hover) {
   .category-trigger:hover {
     background-color: var(--categories-hover-bg);
   }

_sass/layout/category-tag.scss

@@ -13,31 +13,35 @@
     line-height: 1.5rem;
     padding: 0.6rem 0;
 
-    &::before { /* dot */
+    /* dot */
+    &::before {
       background: #999999;
       width: 5px;
       height: 5px;
       border-radius: 50%;
       display: block;
-      content: "";
+      content: '';
       position: relative;
       top: 0.6rem;
       margin-right: 0.5rem;
     }
 
-    > a { /* post's title */
+    /* post's title */
+    > a {
       @extend %no-bottom-border;
 
       font-size: 1.1rem;
     }
 
+    /* post's date */
     > span:last-child {
       white-space: nowrap;
-    } /* post's date */
+    }
   }
 }
 
-#page-tag h1 > i { /* tag icon */
+/* tag icon */
+#page-tag h1 > i {
   font-size: 1.2rem;
 }