Minor UI fixes (#6262)

* Minor UI fixes

* Updating post image size for search

webapp/sass/layout/_post-right.scss

@@ -38,6 +38,10 @@
             }
         }
 
+        .post__img {
+            width: 43px;
+        }
+
         .post__body {
             width: 100%;
         }

webapp/sass/layout/_post.scss

@@ -360,7 +360,6 @@
 
 .post-create__container {
     @include flex(0 0 auto);
-    background: $white;
     width: 100%;
     z-index: 1000;
 

webapp/sass/layout/_sidebar-right.scss

@@ -48,6 +48,10 @@
             }
         }
 
+        .post__img {
+            width: 43px;
+        }
+
         .post__content {
             padding: 0 10px 0 0;
         }