feat: add shimmer background when image loads

_sass/addon/commons.scss

@@ -83,6 +83,47 @@ a {
 img {
   max-width: 100%;
   height: auto;
+
+  &[data-src] {
+    &.lazyloaded {
+      z-index: 1;
+      -webkit-animation: fade-in 0.4s ease-in;
+      animation: fade-in 0.4s ease-in;
+    }
+
+    &[data-lqip="true"] {
+      &.lazyload,
+      &.lazyloading {
+        -webkit-filter: blur(20px);
+        filter: blur(20px);
+      }
+    }
+
+    &:not([data-lqip="true"]) {
+      &.lazyload,
+      &.lazyloading {
+        background: var(--img-bg);
+      }
+    }
+
+    &.shadow {
+      -webkit-filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
+      filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
+      box-shadow: none !important; /* cover the Bootstrap 4.6.1 styles */
+    }
+
+    @extend %img-caption;
+  }
+
+  @-webkit-keyframes fade-in {
+    from { opacity: 0; }
+    to { opacity: 1; }
+  }
+
+  @keyframes fade-in {
+    from { opacity: 0; }
+    to { opacity: 1; }
+  }
 }
 
 blockquote {
@@ -183,49 +224,6 @@ i { /* fontawesome icons */
   }
 }
 
-img[data-src] {
-  @at-root #main #{&} {
-    margin: 0.5rem 0;
-  }
-
-  &[data-lqip="true"] {
-    &.lazyload,
-    &.lazyloading {
-      filter: blur(20px);
-    }
-  }
-
-  &:not([data-lqip="true"]) {
-    &.lazyload,
-    &.lazyloading {
-      opacity: 0;
-    }
-
-    &.lazyloaded {
-      opacity: 1;
-      transition: opacity 0.5s;
-    }
-  }
-
-  &.left {
-    float: left;
-    margin: 0.75rem 1rem 1rem 0;
-  }
-
-  &.right {
-    float: right;
-    margin: 0.75rem 0 1rem 1rem;
-  }
-
-  &.shadow {
-    -webkit-filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
-    filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.08));
-    box-shadow: none !important; /* cover the Bootstrap 4.6.1 styles */
-  }
-
-  @extend %img-caption;
-}
-
 /* --- Panels --- */
 
 .access {
@@ -406,26 +404,14 @@ img[data-src] {
     margin-bottom: 1.5rem;
   }
 
-  img[data-src]:not(.normal):not(.left):not(.right) {
-    @include align-center;
-  }
-
-  a {
-    &.img-link {
-      @extend %no-cursor;
-    }
-
-    /* created by `_includes/img-extra.html` */
-    &.popup {
-      cursor: zoom-in;
-    }
-
-    &:hover {
-      code {
-        @extend %link-hover;
+  p {
+    > img[data-src],
+    > a.popup {
+      &:not(.normal):not(.left):not(.right) {
+        @include align-center;
       }
     }
-  } /* a */
+  }
 }
 
 .pageviews .fa-spinner {
@@ -457,6 +443,14 @@ img[data-src] {
   overflow-wrap: break-word;
 
   a {
+    &.popup {
+      @extend %no-cursor;
+      @extend %img-caption;
+      @include mt-mb(0.5rem);
+
+      cursor: zoom-in;
+    }
+
     &:not(.img-link) {
       @extend %link-underline;
 
@@ -464,10 +458,6 @@ img[data-src] {
         @extend %link-hover;
       }
     }
-
-    &.img-link {
-      @extend %img-caption;
-    }
   }
 
   ol,
@@ -553,6 +543,39 @@ img[data-src] {
   }
 }
 
+.img-link {
+  color: transparent;
+  display: inline-flex;
+
+  @extend %img-rounded;
+}
+
+.shimmer {
+  overflow: hidden;
+  position: relative;
+  background: var(--img-bg);
+
+  &::before {
+    content: "";
+    position: absolute;
+    background: var(--shimmer-bg);
+    height: 100%;
+    width: 100%;
+    -webkit-animation: shimmer 1s infinite;
+    animation: shimmer 1s infinite;
+  }
+
+  @-webkit-keyframes shimmer {
+    0% { -webkit-transform: translateX(-100%); transform: translateX(-100%); }
+    100% { -webkit-transform: translateX(100%); transform: translateX(100%); }
+  }
+
+  @keyframes shimmer {
+    0% { -webkit-transform: translateX(-100%); transform: translateX(-100%); }
+    100% { -webkit-transform: translateX(100%); transform: translateX(100%); }
+  }
+}
+
 /* --- buttons --- */
 .btn-lang {
   border: 1px solid !important;
@@ -622,6 +645,16 @@ img[data-src] {
   transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
 }
 
+.left {
+  float: left;
+  margin: 0.75rem 1rem 1rem 0 !important;
+}
+
+.right {
+  float: right;
+  margin: 0.75rem 0 1rem 1rem !important;
+}
+
 /* --- Overriding --- */
 
 /* magnific-popup */

_sass/addon/module.scss

@@ -90,6 +90,10 @@
   font-style: normal;
 }
 
+%img-rounded {
+  border-radius: 10px;
+}
+
 %img-caption {
   + em {
     display: block;
@@ -114,6 +118,11 @@
   text-decoration: none;
 }
 
+@mixin mt-mb($value) {
+  margin-top: $value;
+  margin-bottom: $value;
+}
+
 @mixin ml-mr($value) {
   margin-left: $value;
   margin-right: $value;

_sass/colors/dark-typography.scss

@@ -26,6 +26,14 @@
   --label-color: rgb(108, 117, 125);
   --checkbox-color: rgb(118, 120, 121);
   --checkbox-checked-color: var(--link-color);
+  --img-bg: radial-gradient(circle, rgb(22, 22, 24) 0%, rgb(32, 32, 32) 100%);
+  --shimmer-bg:
+    linear-gradient(
+      90deg,
+      rgba(255, 255, 255, 0) 0%,
+      rgba(58, 55, 55, 0.4) 50%,
+      rgba(255, 255, 255, 0) 100%
+    );
 
   /* Sidebar */
   --sidebar-bg: radial-gradient(circle, #242424 0%, #1d1f27 100%);
@@ -65,7 +73,6 @@
   --card-bg: rgb(39, 40, 43);
   --card-border-color: rgb(53, 53, 60);
   --card-box-shadow: var(--main-bg);
-  --preview-img-bg: radial-gradient(circle, rgb(22, 22, 24) 0%, rgb(32, 32, 32) 100%);
   --kbd-wrap-color: #6a6a6a;
   --kbd-text-color: #d3d3d3;
   --kbd-bg-color: #242424;

_sass/colors/light-typography.scss

@@ -24,6 +24,14 @@
   --btn-box-shadow: #eaeaea;
   --checkbox-color: #c5c5c5;
   --checkbox-checked-color: #07a8f7;
+  --img-bg: radial-gradient(circle, rgb(255, 255, 255) 0%, rgb(249, 249, 249) 100%);
+  --shimmer-bg:
+    linear-gradient(
+      90deg,
+      rgba(250, 250, 250, 0) 0%,
+      rgba(232, 230, 230, 1) 50%,
+      rgba(250, 250, 250, 0) 100%
+    );
 
   /* Sidebar */
   --sidebar-bg: #eeeeee;
@@ -64,7 +72,6 @@
   --tb-odd-bg: #fbfcfd;
   --tb-border-color: #eaeaea;
   --dash-color: silver;
-  --preview-img-bg: radial-gradient(circle, rgb(255, 255, 255) 0%, rgb(249, 249, 249) 100%);
   --kbd-wrap-color: #bdbdbd;
   --kbd-text-color: var(--text-color);
   --kbd-bg-color: white;

_sass/layout/post.scss

@@ -26,12 +26,23 @@
   color: var(--text-color);
 }
 
-img.preview-img {
+%preview-margin {
   margin: 0;
-  border-radius: 6px;
+}
+
+.preview-img {
+  @include align-center;
+  @extend %preview-margin;
 
   &:not(.no-bg) {
-    background: var(--preview-img-bg);
+    img.lazyloaded {
+      background: var(--img-bg);
+    }
+  }
+
+  img {
+    @extend %preview-margin;
+    @extend %img-rounded;
   }
 }