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var y = getComputedStyle(document.documentElement).getPropertyValue('--y');
var z = getComputedStyle(document.documentElement).getPropertyValue('--z');
t = z[1];
t = parseInt(t);
u = y[1];
u = parseInt(u);
function add(){
txt = document.getElementById("value");
p = t - 0.1;
//alert(p);
txt.textContent = p;
document.documentElement.style.setProperty('--z', p + "vw");
t = p;
}