Login Popup broken on iPad portrait - Fix for blank theme

Author: ihor-sviziev

app/design/frontend/Magento/blank/web/css/source/components/_modals_extend.less

@@ -16,7 +16,7 @@
 
 @modal-popup-title__font-size: 26px;
 @modal-popup-title-mobile__font-size: @font-size__base;
-@modal-popup-breakpoint-screen__m: @screen__m + 1;
+@modal-popup-breakpoint-screen__m: @screen__m;
 
 @modal-slide__first__indent-left: 44px;
 @modal-slide-mobile__background-color: @color-gray-light01;