@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100&display=swap');

* {
  box-sizing: border-box;
  font-family: 'Roboto', sans-serif;
  font-weight: bold;
}

body {
  padding: 0;
  margin: 0;
}

#calculator {
  width: 420px;
  height: auto;
  background-color: #eaedef;
  margin: 0 auto;
  top: 20px;
  position: relative;
  border-radius: 5px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
.result {
  height: 120px;
  background: #515354;
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  flex-direction: column;
  padding: 10px;
  word-wrap: break-word;
  word-break: break-all;
}

.result .previous-input {
  color: #ffffe6;
  font-size: 1.5rem;
}

.result .current-input {
  color: #ffffe6;
  font-size: 2.5rem;
}

.operator,
.number,
#btnAC,
#btnDel,
#btnEquals {
  width: 100px;
  height: 100px;
  outline: none;
  cursor: pointer;
  border: 1px solid #565454;
  font-size: 1.4rem;
  background: #7f7e7d;
  color: #fff;
  margin: 1px;
}

#keyboard {
  background: #515354;
}

#calculator button:hover {
  background: rgba(127, 126, 125, 0.8);
}

#btnZero {
  width: 206px;
}

#btnAC {
  background: #ff5952;
}

#btnEquals {
  background: #008000;
}