asi-calculator/components/FormAmount.module.css

.form {
  display: inline-block;
}

.input {
  all: unset;
  width: 70px;
  padding-left: 0.2rem;
  padding-right: 0.2rem;
  text-align: center;
  background-color: rgba(var(--foreground-rgb), 0.15);
  border-radius: var(--border-radius);
}

.input:hover {
  background-color: rgba(var(--foreground-rgb), 0.2);
}

.input:focus-within {
  outline: none;
  background-color: rgba(var(--foreground-rgb), 0.3);
  color: rgb(var(--foreground-rgb-highlight));
}