style.css

h1 {
  text-align: center;
  color: rgb(52, 45, 58);
}

.calculator {
  width: 400px;
  margin: 0 auto;
  border: 5px solid rgb(61, 58, 58);
  border-radius: 8px;
  background-color: rgb(46, 43, 43);
  padding: 8px;
}

.display, .display-last {
  padding: 16px;
  text-align: right;
  background-color: rgb(172, 167, 177);
}

.display-large {
  font-size: 3.5rem;
}

.display-last {
  border-bottom: 1px solid black;
  height: 52px;
  font-size: 1rem;
}

.display {
  margin-bottom: 8px;
}

.control {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  /* width: 400px; */
  
}

button {
  padding: 32px;
  border-radius: 8px;
  border: none;
  flex: 1;
  width: 95px;
  background-color: rgb(112, 82, 140);  
  color: white;
  font-size: 1.5rem;
}

.operator {
  background-color: rgb(82, 140, 118); 
}

.reset, .sign, .percent, .decimal {
  background-color: rgb(197, 117, 13); 
}

#btn0 {
  flex-basis: 166px;
}