let htmlWidth = document.documentElement.clientWidth || document.body.clientWidth;
let htmlDome = document.getElementsByTagName('html')[0];
htmlDome.style.fontSize = htmlWidth / 7.5 + 'px';
let htmlWidth = document.documentElement.clientWidth || document.body.clientWidth;
let htmlDome = document.getElementsByTagName('html')[0];
htmlDome.style.fontSize = htmlWidth / 7.5 + 'px';