Add solitude

themes/solitude/source/css/_highlight/highlight/diff.styl

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+figure.highlight
+  table::-webkit-scrollbar
+    color var(--efu-secondbg)
+    height 6px
+    background var(--efu-hl-bg)
+    border-radius 6px
+    display initial
+
+  .keyword
+  .attr
+  .variable
+  .literal
+  .property
+    color $highlight-variable-light
+
+  .number
+    color $highlight-number-light
+
+  .string
+    color $highlight-string-light
+
+  .built_in
+  .title
+  .params
+  .name
+    color $highlight-title-light
+
+  .emphasis
+    color $highlight-emphasis-light
+
+  [data-theme=dark] &  
+    .keyword
+    .attr
+    .variable
+    .property
+      color $highlight-variable-dark
+
+    .number
+      color $highlight-number-dark
+
+    .string
+      color $highlight-string-dark
+
+    .built_in
+    .built_in
+    .title
+    .params
+      color $highlight-title-dark
+
+    .emphasis
+      color $highlight-emphasis-dark

themes/solitude/source/css/_highlight/highlight/index.styl

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+@import "diff"
+figure
+  pre
+    margin 0
+    padding 8px 0
+    border none
+  table
+    display block
+    border none
+    overflow-y hidden
+    overflow-x auto
+
+    td
+      padding 0
+      border none
+      height 100%
+
+      &.gutter
+        opacity .6
+        user-select none
+        min-width initial
+
+        pre
+          overflow auto
+          line-height 1.6
+          margin 0
+          padding 8px .5rem
+          border none
+          color var(--efu-secondtext)
+          background var(--efu-secondbg)
+          border-right var(--style-border-always)
+          text-align center
+
+      &.code
+        width 100%
+        display flex
+        position relative
+
+        pre
+          padding-right .5rem
+          padding-left .5rem
+          width 100%
+
+  .line
+    &.marked
+      background-color: rgba(97, 97, 97, .314)