style.css

@import url('https://fonts.googleapis.com/css2?family=Ubuntu&display=swap');

* {
  font-family: 'Ubuntu', sans-serif;
}

body {
  background-image: linear-gradient(to right, #141e30, #243b55);
}

h1 { 
  text-align: center;
  color: wheat;
}

.buttons {
  margin: 0 10px;
  padding: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}

.operatorBtn,
#equalBtn {
  background-color: #f0932b;
}

button {
  margin: 3px;
  width: 90px;
  height: 90px;
  border: 0px black;
  border-radius: 50%;
  text-align: center;
  font-size: 30px;
  background-color: #313131;
  color: white;
}

.clear button {
  border-radius: 45px;
  background-color: #ef3f2a;
}

.display {
  display: flex;
  flex-direction: column;
  text-align: right;
  margin: 0px 10px;
  /* border: 1px solid pink; */
}

#primary-display {
  font-size: 60px;
}

#secondary-display {
  height: 30px;
  font-size: 30px;
  color: gray;
}

.clear {
  align-self: flex-start;
  width: 410px;
  display: flex;
  flex-direction: row;
  /* border: 1px solid pink; */
}

.clear button {
  padding: 20px 40px;
  width: 100%;
}

.calculator {
  border-radius: 30px;
  margin: 0 auto;
  width: 410px;
  background-color: black;
  padding: 20px;
  color: white;
}