.largo {
  width: 108px;
  margin-left: 2px;
}

button {
   color: black;
   background-color: Gray;
   width: 50px;
   height: 50px;
   margin: 2px;
   border-radius: 15px;
   font-weight: bold;
   font-size: 15px;
   border: solid;
}

#numberBox {
   border: solid 3px;
   border-radius: 15px;
   height: 40px;
   width: 220px;
   margin: 0 auto;
   font-size: 20px;
   font-weight: bold;
   display: flex;
   justify-content: center;
   align-items: center;
   background-color: DarkSeaGreen;
}

h1 {
 color: black;
 background-color: lightyellow;
 border-radius: 15px;
}

body {
 background-color: LightSlateGray;
}

.calculadora {
  border: solid 5px;
  width: 260px;
  padding: 15px 0 15px 0;
  border-radius: 20px;
  background-color: darkslategray;
}

.web {
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%);
}