css: fix stylelint complaints.

app/javascript/src/styles/specific/common_tooltips.scss

@@ -13,12 +13,12 @@ div[data-tippy-root].tooltip-loading {
 
   /* bordered arrow styling; see https://github.com/atomiks/tippyjs/blob/master/src/scss/themes/light-border.scss */
   &[data-placement^=bottom] {
-    > .tippy-arrow:before {
+    > .tippy-arrow::before {
       border-bottom-color: var(--post-tooltip-background-color);
       bottom: 16px;
     }
 
-    > .tippy-arrow:after {
+    > .tippy-arrow::after {
       border-bottom-color: var(--post-tooltip-border-color);
       border-width: 0 7px 7px;
       top: -8px;
@@ -27,11 +27,11 @@ div[data-tippy-root].tooltip-loading {
   }
 
   &[data-placement^=top] {
-    > .tippy-arrow:before {
+    > .tippy-arrow::before {
       border-top-color: var(--post-tooltip-background-color);
     }
 
-    > .tippy-arrow:after {
+    > .tippy-arrow::after {
       border-top-color: var(--post-tooltip-border-color);
       border-width: 7px 7px 0;
       top: 17px;
@@ -39,7 +39,7 @@ div[data-tippy-root].tooltip-loading {
     }
   }
 
-  > .tippy-arrow:after {
+  > .tippy-arrow::after {
     border-color: transparent;
     border-style: solid;
     content: "";

app/javascript/src/styles/specific/posts.scss

@@ -1,14 +1,14 @@
 @keyframes heartbeat {
   0% {
-    transform:scale(1);
+    transform: scale(1);
   }
 
   50% {
-    transform:scale(1.3);
+    transform: scale(1.3);
   }
 
   100% {
-    transform:scale(1);
+    transform: scale(1);
   }
 }
 

app/javascript/src/styles/specific/related_tags.scss

@@ -16,10 +16,9 @@ div.related-tags {
   }
 
   li.selected a {
-    /* https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-stroke */
-    /* https://caniuse.com/text-stroke */
+    // https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-stroke
+    // https://caniuse.com/text-stroke
     -webkit-text-stroke: 0.5px;
-    text-stroke: 0.5px;
   }
 
   /* On computers with a mouse, hide the related tag checkbox unless it's checked or hovered. */

app/javascript/src/styles/specific/user_tooltips.scss

@@ -22,7 +22,7 @@
 
       .user-tooltip-badge {
         color: var(--inverse-text-color);
-        font-size: 0.70em;
+        font-size: 0.7em;
         padding: 2px 4px;
         margin-right: 0.25em;
         border-radius: 3px;
@@ -87,7 +87,7 @@
       }
 
       .user-tooltip-stat-name {
-        font-size: 0.90em;
+        font-size: 0.9em;
         color: var(--muted-text-color);
       }
     }