index.css

html,
body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1em;
  background: #000;
  color: #fff;
  text-align: center;
}

p,
.heading {
  margin-top: 2em;
}

/* typography */

h1 {
  font-size: 1.5em;
  margin: 0 1em;
}

h2 {
  font-weight: 600;
}

p,
span {
  font-weight: 600;
  color: #fff;
}

input {
  font-weight: 600;
  font-size: 6em;
  font-family: 'Inter', sans-serif;
  color: #fff;
  padding: 0.25em;
  text-align: center;
}

p,
.light-text {
  font-weight: 400;
  color: #d2d2d2;
}

p,
.dark-text {
  font-weight: 600;
  color: #fff;
}

/* Layout */

.container {
  margin: 2em auto;
  max-width: 550px;
  display: flex;
  flex-direction: column;
  border: 5px solid white;
  border-radius: 5px;
}

.light-section,
input {
  background-color: #ddd;
  background: linear-gradient(246.26deg, #585dfe 0%, #fb3796 100%);
  display: flex;
  flex-direction: column;
  /* padding-top: 0.5em; */
  border: 0;
}

.dark-section {
  margin: 0;
  padding: 1.5em;
  background-color: #1f2937;
}

@media (max-height: 500px) {
  .container {
    align-items: center;
  }
  .light-section,
  .dark-section {
    width: 100%;
  }
}