:root {
  --bg-light: #a5a5a5;
  --bg-dark: #333;
  --bg-orange: #f1a33c;

  --ff-helvetica: Helvetica, sans-serif;
  --fs-lg: 45px;
  --fs-sm: 30px;
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  height: 100vh;
  width: 100vw;

  justify-content: center;
  align-items: center;
  color: #fff;
}

.main {
  background-color: #000;
  /* height: 70px; */
  /* width: 500px; */
  border-radius: 50px;
  padding: 20px;
}

.screen {
  /* background-color: aqua; */
  width: 100%;
  height: 250px;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(5, 1fr);
  gap: 0.5rem;
  font-family: var(--ff-helvetica);
  font-size: var(--fs-lg);
}

.button {
  height: 90px;
  width: 90px;
  background-color: #f1a33c;
  border-radius: 50%;
  margin: auto;

  display: flex;
  justify-content: center;
  align-items: center;
  &:hover {
    opacity: 0.5;
  }
}

.buttons .zero {
  grid-column: span 2;
  width: 100% !important;
  border-radius: 45px !important;
  padding-left: 30px;
  justify-content: left;
}

.light {
  background-color: var(--bg-light);
  color: #000;
}
.dark {
  background-color: var(--bg-dark);
}
.yellow {
  background-color: var(--bg-orange);
}

@media screen and (max-width: 450px) {
  .main {
    height: 750px;
  }
  .screen {
    height: 250px;
    margin-bottom: 30px;
  }
  .button {
    height: 80px;
    width: 80px;
    border-radius: 50px;
    font-size: var(--fs-sm);
  }
  .buttons{
    gap: .3rem;
  }
}