body{
  background-color: #d0d0d0;  
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
font-family: 'Segoe UI',  sans-serif;
}
.calculadora{
background-color:#8bc5ec;
padding: 20px;
border-radius:20px;
box-shadow: 0 10px 25px;
width: 320px;
}
.visor{
  background-color: black;
  color: rgb(0, 174, 255);
  font-size: 36px;
  text-align: right;
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow:inset 008px rgb(1, 81, 146) ;
  height: 60px;
  overflow-x: auto;
}
.botoes{
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 10px;
}
button {
  padding: 20px;
  font-size: 20px;
  border: none;
  border-radius: 10px;
  background-color: #555;
  color: white;
  cursor: pointer;
  transition: 0.2s;
}

button:hover {
  background-color: #777;
}

button.igual {
  background-color: #022f85;
  grid-row: span 2;
}

button.igual:hover {
  background-color: #022f85;
}

button.zero {
  grid-column: span 2;
}