*, *::before, *::after { box-sizing:border-box; }
html, body { width:100%; max-width:100%; overflow-x:hidden; }
img, video, svg, canvas { max-width:100%; height:auto; }
input, select, textarea, button { max-width:100%; }
table { max-width:100%; }
@media (max-width:700px) {
  body { font-size:15px; }
  h1 { font-size:clamp(1.6rem,7vw,2.2rem); }
  h2 { font-size:clamp(1.3rem,6vw,1.8rem); }
}