remove unused styles and add title fallback

ui/component/button/view.jsx

@@ -77,7 +77,6 @@ const Button = forwardRef<any, {}>((props: Props, ref: any) => {
           'button--primary': button === 'primary',
           'button--secondary': button === 'secondary',
           'button--alt': button === 'alt',
-          'button--danger': button === 'danger',
           'button--inverse': button === 'inverse',
           'button--close': button === 'close',
           'button--disabled': disabled,

ui/component/header/view.jsx

@@ -144,7 +144,9 @@ const Header = (props: Props) => {
         {!authHeader && backout ? (
           <div className="card__actions--between">
             <Button onClick={backout.backFunction} button="link" label={__('Cancel')} icon={ICONS.ARROW_LEFT} />
-            {backout.title && <h1 className={'card__title'}>{isMobile ? backout.simpleTitle : backout.title}</h1>}
+            {backout.title && (
+              <h1 className={'card__title'}>{isMobile ? backout.simpleTitle || backout.title : backout.title}</h1>
+            )}
             <Button
               aria-label={__('Your wallet')}
               navigate={`/$/${PAGES.WALLET}`}

ui/scss/component/tabs.scss

@@ -29,19 +29,6 @@
   }
 }
 
-.tabs__list--select-asset {
-  margin-bottom: var(--spacing-l);
-  padding: var(--spacing-m) 0;
-
-  height: 4rem;
-  border-bottom-left-radius: var(--card-radius);
-  border-bottom-right-radius: var(--card-radius);
-
-  @media (max-width: $breakpoint-small) {
-    padding-left: var(--spacing-m);
-  }
-}
-
 .tab {
   @extend .button--link;
   margin-right: var(--spacing-l);