* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  background-color: rgb(241, 241, 241);
}

:root {
  --background-clr: rgb(97, 97, 97);
}

h3 {
  display: grid;
  padding-top: 2rem;
  justify-content: center;
}

h1 {
  display: grid;
  justify-content: center;
  font-size: 5rem;
  padding: 0rem 2rem 2rem 2rem;
  color: #0197f6;
}

.container {
  display: grid;
  justify-content: center;
  width: 100vw;
}

.calculator {
  display: grid;
  justify-items: center;
  grid-template-rows: 1fr 3fr;
  /* border: 2px solid; */
  height: auto;
  width: 100vw;
  align-items: center;
  gap: 5px;
}

.screen-container {
  display: grid;
  justify-self: center;
  grid-template-rows: 1fr 2fr;
  border: 2px solid;
  height: 100%;
  width: 100%;
  max-width: 415px;
  border: 2px solid;
}

.previous-display {
  background-color: var(--background-clr);
  color: white;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  width: 100%;
  padding-left: 1rem;
  padding-right: 1rem;
  font-size: 1rem;
  border-bottom: 2px solid gray;
}

.current-display {
  color: white;
  background-color: var(--background-clr);
  /* width: 415px; */
  overflow-wrap: break-word;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  font-size: 3rem;
  padding: 1rem;
  border-bottom: 2px solid black;
}

.buttons {
  display: grid;
  width: 100%;
  height: 100%;
  gap: 5px;
  grid-template-columns: repeat(4, 100px);
  grid-template-rows: repeat(5, 100px);
  justify-content: center;
}

.btn {
  color: #000000;
  background-color: var(--background-clr);
  font-size: 2rem;
  box-shadow: 1px 1px 0 0;
  border-radius: 5px;
}

.btn i:hover {
  background-color: grey;
  color: black;
}

.btn i {
  display: grid;
  background-color: var(--background-clr);
  color: white;
  width: 100%;
  height: 100%;
  align-self: center;
  place-items: center;
  background: transparent;
}

.operator i {
  color: gray;
  background: transparent;
}

.operator i:hover {
  background-color: grey;
  color: black;
}

.equals {
  width: 205px;
}

@media screen and (max-width: 450px) {
  h3 {
    justify-content: center;
    display: grid;
    font-size: 12px;
    padding-top: 20px;
  }

  h1 {
    font-size: 35px;
    padding: 0px 20px 20px 20px;
    display: grid;
    justify-content: center;
    width: 100vw;
    color: #0197f6;
  }

  .container {
    display: grid;
    justify-content: center;
    width: 100vw;
  }

  .calculator {
    display: grid;
    justify-items: center;
    grid-template-rows: 1fr 3fr;
    height: 560px;
    width: 100vw;
    align-items: start;
  }

  .screen-container {
    display: grid;
    width: 95vw;
    height: 100%;
    justify-self: center;
    grid-template-rows: 1fr 2fr;
    border: 2px solid;
  }

  .previous-display {
    display: flex;
    background-color: var(--background-clr);
    color: white;
    justify-content: flex-end;
    align-items: center;
    padding-left: 1rem;
    padding-right: 1rem;
    font-size: 1rem;
    border-bottom: 2px solid gray;
  }

  .current-display {
    display: flex;
    color: white;
    background-color: var(--background-clr);
    overflow-wrap: break-word;
    justify-content: flex-end;
    align-items: center;
    font-size: 3rem;
    padding: 1rem;
    border-bottom: 2px solid black;
  }

  .buttons {
    display: grid;
    width: 100%;
    gap: 3px;
    height: 400px;
    grid-template-columns: repeat(4, 23%);
    grid-template-rows: repeat(5, 20%);
    justify-content: center;
  }

  .btn {
    color: #000000;
    background-color: var(--background-clr);
    font-size: 1.5rem;
    box-shadow: 1px 1px 0 0;
    border-radius: 5px;
  }

  .btn i:hover {
    background-color: rgb(153, 153, 153);
    color: black;
  }

  .btn i {
    display: grid;
    background-color: var(--background-clr);
    color: white;
    width: 100%;
    height: 100%;
    align-self: center;
    place-items: center;
    background: transparent;
  }

  .operator i {
    color: rgb(177, 177, 177);
    background: transparent;
  }

  .operator i:hover {
    background-color: grey;
    color: black;
  }

  .equals {
    width: 203%;
  }
}