:root {
  color-scheme: light;
  --green: #257a5a;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  background: #f3f7f5;
  font-family: Arial, Helvetica, sans-serif;
}

main {
  width: min(260px, calc(100vw - 32px));
}

button {
  width: 100%;
  min-height: 96px;
  border: 1px solid var(--green);
  border-radius: 8px;
  background: var(--green);
  color: #ffffff;
  cursor: pointer;
  font: 900 2rem Arial, Helvetica, sans-serif;
}

button:active {
  transform: translateY(2px);
}