效果美化及若干效果bug修复

themes/yilia/source-src/css/grid.scss

@@ -27,10 +27,13 @@ html, body, #container {
 	.anm-canvas {
 		display: none;
 	}
-	&.show .anm-canvas {
-		display: block;
-		position: fixed;
-	}
+  &.show {
+    overflow-y: hidden;
+    .anm-canvas {
+      display: block;
+      position: fixed;
+    }
+  }
 }
 .body-wrap{
   padding-top: 30px;

themes/yilia/source-src/css/left.scss

@@ -1,21 +1,13 @@
 .left-col {
-	background: $colorBg;
+  background: $colorBg url(./img/left_bg.jpg) no-repeat;
+  background-size: cover;
 	width: 300px;
 	position:fixed;
 	opacity:1;
 	@extend %trans;
 	height:100%;
-	z-index: 999;
-	&.show {
-		@extend %shadow;
-	}
-	.overlay{
-		width: 100%;
-		height: 130px;
-		position: absolute;
-    background: #4d4d4d;
-    @extend %trans;
-	}
+  z-index: 999;
+  @extend %shadow;
 
 	.intrude-less {
 		width: 76%;

themes/yilia/source-src/css/night.scss

@@ -105,9 +105,6 @@ body.night {
       display: none;
     }
   }
-  .overlay {
-    background: none;
-  }
   // 头像 看板娘 图标 -> 降低亮度滤镜
   .profilepic, .waifu, #header .header-nav .social a {
     filter: brightness(30%);