1.0.12 restore strange line on firefox mobile

sass/base.scss

@@ -267,7 +267,6 @@ $v-unit-6: 24rem;
     top: 0;
     background-color: $bgcolor;
     z-index: 9;
-
     @if $side==left {
       left: $minusOffset;
       border-left: $bordercolor solid 1px;
@@ -1903,13 +1902,14 @@ $padd: 2rem;
         width: calc(100vw - #{$h-unit-1});
         bottom: unset !important;
         height: $h-unit-1;
-        height: calc(#{$h-unit-1} - 0.5px);
+        // height: calc(#{$h-unit-1} - 0.5px);
         position: relative;
         align-self: flex-end;
         display: flex;
         flex-direction: column;
         justify-content: center;
         padding-left: 0;
+        border-left: #fff solid 1px;
 
         @include single-metadata();
 
@@ -2731,7 +2731,7 @@ body.page {
       color: $color !important;
     }
 
-    @media #{$only-mobile}, print  {
+    @media #{$only-mobile}, print {
       &::before,
       &::after {
         border-color: $color !important;
@@ -2739,7 +2739,7 @@ body.page {
     }
   }
   h2 {
-    @media #{$only-mobile}, print  {
+    @media #{$only-mobile}, print {
       border-top-color: $color !important;
     }
   }