https://github.com/b3log/solo/issues/12757

Casper/css/base.scss

@@ -72,7 +72,7 @@ a {
       width: 100%;
       top: 0;
       background-size: cover;
-      filter: brightness(38%);
+      filter: brightness(48%);
     }
   }
   &--article {
@@ -99,7 +99,7 @@ a {
       width: 100%;
       top: 0;
       background-size: cover;
-      filter: brightness(38%);
+      filter: brightness(48%);
     }
     .header__nav a {
       margin-bottom: 0;
@@ -349,7 +349,7 @@ a {
         width: 100%;
         background: url(../images/header-bg.jpg) no-repeat center center;
         background-size: cover;
-        filter: brightness(38%);
+        filter: brightness(48%);
       }
       h3 {
         color: #fff;
@@ -475,6 +475,7 @@ a {
       max-width: 1404px;
       margin: 0 auto;
       border-radius: 5px;
+      filter: sepia(0.2) contrast(1.3) opacity(.86);
     }
     &__content {
       padding: 70px 100px 0;
@@ -482,6 +483,7 @@ a {
       background-color: #fff;
       &--article {
         margin-top: -164px;
+        position: relative;
       }
     }
     &__tip {