Upgrade to Gatsby v2

src/components/Post/Post.module.scss

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+@import '../../assets/scss/variables';
+@import '../../assets/scss/mixins';
+
+.post {
+  &__footer {
+    max-width: $layout-post-width;
+    margin: 0 auto;
+    padding: 0 15px;
+  }
+
+  &__comments {
+    max-width: $layout-post-width;
+    margin: 0 auto;
+    padding: 0 15px;
+  }
+
+  &__home-button {
+    display: block;
+    width: 90px;
+    height: 35px;
+    font-size: $typographic-base-font-size;
+    padding: 0 16px;
+    line-height: 35px;
+    text-align: center;
+    color: lighten($color-base, 20%);
+    background: $color-gray-bg;
+    font-weight: normal;
+    border-radius: 3px;
+    margin-left: auto;
+    margin-right: auto;
+    @include margin-top(1);
+
+    &:hover,
+    &:focus {
+      color: $color-base;
+      background: darken($color-gray-bg, 5%);
+      border: 0
+    }
+
+  }
+
+}
+
+@include breakpoint-md {
+  .post {
+    &__footer {
+      padding: 0;
+    }
+
+    &__comments {
+      padding: 0;
+    }
+
+    &__home-button {
+      max-width: auto;
+      position: fixed;
+      margin: 0;
+      top: 30px;
+      left: 30px
+    }
+
+  }
+
+}