removes redundant styles

app/assets/stylesheets/pages/notes.scss

@@ -174,123 +174,7 @@ ul.notes {
       }
 
       .system-note {
-        font-size: 14px;
         padding: 0;
-        clear: both;
-
-        &.timeline-entry::after {
-          clear: none;
-        }
-
-        .system-note-message {
-          display: inline-block;
-
-          &::first-letter {
-            text-transform: lowercase;
-          }
-
-          a {
-            color: $gl-link-color;
-            text-decoration: none;
-          }
-
-          p {
-            display: inline-block;
-            margin: 0;
-
-            &::first-letter {
-              text-transform: lowercase;
-            }
-          }
-        }
-
-        .timeline-content {
-          padding: 14px 12px;
-        }
-
-        .note-body {
-          overflow: hidden;
-
-          .system-note-commit-list-toggler {
-            display: none;
-            padding: 10px 0 0;
-            cursor: pointer;
-            position: relative;
-            z-index: 2;
-
-            &:hover {
-              color: $gl-link-color;
-              text-decoration: underline;
-            }
-          }
-
-          .note-text {
-            & p:first-child {
-              display: none;
-            }
-
-            &.system-note-commit-list {
-              max-height: 63px;
-              overflow: hidden;
-              display: block;
-
-              ul {
-                margin: 3px 0 3px 15px !important;
-
-                li {
-                  font-family: $monospace_font;
-                  font-size: 12px;
-                }
-              }
-
-              p:first-child {
-                display: none;
-              }
-
-              p:last-child {
-                a {
-                  color: $gl-text-color;
-
-                  &:hover {
-                    color: $gl-link-color;
-                  }
-                }
-              }
-
-              &::after {
-                content: '';
-                width: 100%;
-                height: 67px;
-                position: absolute;
-                left: 0;
-                bottom: 0;
-                background: linear-gradient(rgba($gray-light, 0.1) -100px, $white-light 100%);
-              }
-
-              &.hide-shade {
-                max-height: 100%;
-                overflow: auto;
-
-                &::after {
-                  display: none;
-                  background: transparent;
-                }
-              }
-            }
-          }
-        }
-
-        .timeline-icon {
-          display: none;
-
-          .avatar {
-            visibility: hidden;
-
-            .discussion-body & {
-              visibility: visible;
-            }
-          }
-        }
       }
     }