Fix #1030

sass/base/helpers.sass

@@ -93,7 +93,7 @@ $alignments: ('centered': 'center', 'left': 'left', 'right': 'right')
   a.has-text-#{$name}
     &:hover,
     &:focus
-      color: darken($color, 10%)
+      color: darken($color, 10%) !important
 
 @each $name, $shade in $shades
   .has-text-#{$name}
@@ -105,7 +105,7 @@ $displays: 'block' 'flex' 'inline' 'inline-block' 'inline-flex'
 
 @each $display in $displays
   .is-#{$display}
-    display: #{$display}
+    display: #{$display} !important
   +mobile
     .is-#{$display}-mobile
       display: #{$display} !important