fix mixins screen and screen-height
fix mixins screen and screen-height

Rocketweb-FED/magento2-theme-blank-sass,SnowdogApps/magento2-theme-blank-sass,SnowdogApps/magento2-theme-blank-sass,gil--/magento2-theme-blank-sass,gil--/magento2-theme-blank-sass,Rocketweb-FED/magento2-theme-blank-sass