style.css

* {
  font-family: Roboto, sans-serif;
}

body {
  background-color: #e4e4e4;
}

.calculator {
  width: 300px;
  height: auto;
  margin: 70px auto;
  background-color: whitesmoke;
  border-radius: 25px;
  box-shadow: 5px 5px 30px #d5d5d5;
}

.screen {
  height: 150px;
  display: flex;
  flex-direction: row-reverse;
  align-items: flex-end;
}

p {
  font-size: 54px;
  margin: 0px 15px 5px 0px;
}

.keyboard {
  display: flex;
  flex-direction: column;
}

.row {
  display: flex;
}

input {
  flex-grow: 1;
  width: 75px;
  height: 70px;
  border-style: none;
  font-size: 16px;
}

input[value="AC"] {
  border-top-left-radius: 25px;
}

input[value="÷"] {
  border-top-right-radius: 25px;
}

input[value="0"] {
  border-bottom-left-radius: 25px;
}

input[value="="] {
  border-bottom-right-radius: 25px;
}

.operators,
.equal {
  font-size: 20px;
  color: #f25f5c;
}

.topRow {
  color: #52b788;
}

#zero {
  width: 150px;
}

footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  font-size: 14px;
  padding-bottom: 5px;
}

a {
  color: black;
}