refactor from PostCSS to SASS

assets/css/footer.css

@@ -1,50 +0,0 @@
-.footer {
-  padding: 40px 0;
-  flex-grow: 0;
-  opacity: .5;
-
-  &__inner {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    margin: 0;
-    width: 760px;
-    max-width: 100%;
-
-    @media (--tablet) {
-      flex-direction: column;
-    }
-  }
-
-  a {
-    color: inherit;
-  }
-
-  .copyright {
-    display: flex;
-    flex-direction: row;
-    align-items: center;
-    font-size: 1rem;
-    color: var(--light-color-secondary);
-
-    &--user {
-      margin: auto;
-      text-align: center;
-    }
-
-    & > *:first-child:not(:only-child) {
-      margin-right: 10px;
-
-       @media (--tablet) {
-        border: none;
-        padding: 0;
-        margin: 0;
-      }
-    }
-
-    @media (--tablet) {
-      flex-direction: column;
-      margin-top: 10px;
-    }
-  }
-}