/* 1. Add this at the very top of the stylesheet (or in a global reset) */
*, *::before, *::after {
    box-sizing: border-box;
}

/* 2. Add overflow-x: hidden to your existing global reset block */
html,
body,
#page,
.site,
#content,
.site-content,
.content{
    width:100% !important;
    max-width:100% !important;
    margin:0 !important;
    padding:0 !important;
    overflow-x: hidden !important;   /* ← add this line */
}