.container {
  width: 100%;
  height: 100vh;
  background: #e3f9ff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calculator {
  background: #3a4452;
  padding: 20px;
  border-radius: 10px;
}

.calculator form input {
  border: 0;
  outline: 0;
  width: 60px;
  height: 60px;
  border-radius: 10px;
  box-shadow: -8px -8px 15px rgba(225, 225, 225, 0.1), 5px 5px 15px rgba(0, 0, 0, 0.2);
  background: transparent;
  font-size: 20px;
  color: #fff;
  cursor: pointer;
  margin: 10px;
}

form .display {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 15px;
  margin: 20px, 0;
  box-shadow: 0px 0px 15px 3px rgba(0, 0, 0, 0.4);
  border-radius: 15px;
}

form .display input {
  text-align: right;
  flex: 1;
  font-size: 45px;
  box-shadow: none;
}

form input.equal {
  width: 145px;
}

form input.operator {
  color: #33ffd8
}

.author {
  align-items: center;
  justify-content: center;
  display: flex;
}

h4 {
  color: white;
  letter-spacing: 1.4px;
  margin-top: none;
  margin-bottom: 10px;
  font-size: small;
  text-decoration: underline;
  align-items: center;
  justify-content: center;
  align-content: center;
  color: #33ffd8;
}

.title {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap-reverse;
  gap: 10px;
  margin-top: none;
  color: #33ffd8;
  letter-spacing: 3px;
  transition: 0.5s;
}