html {
  scroll-behavior: smooth;
  font-size: 62.5%; /* 16px(default) * .625 = 10px */
}

body {
  margin: 0;
  font-size: 2rem; /* 20px */
}

input, textarea {
  outline: none;
  -webkit-appearance: none;
}
input:-webkit-autofill,
input:-webkit-autofill:hover, 
input:-webkit-autofill:focus,
textarea:-webkit-autofill,
textarea:-webkit-autofill:hover,
textarea:-webkit-autofill:focus,
select:-webkit-autofill,
select:-webkit-autofill:hover,
select:-webkit-autofill:focus {
  background: red !important;
  -webkit-text-fill-color: inherit;
}