body {
  background-image: url("fondo.gif");
}

#display {
  border-style: groove;
  border-width: 10px;
  border-color: lightgreen;
  text-align: center;
  background-color: blue;
  color: white;
}

#display:hover {
  border-color: red;
  background-color: yellow;
  color: black;
}

div {
    text-align: center;
}

img {
  height: 20px;
  margin-left: 0px;
}

.boton {
  text-decoration: none;
  padding: 10px;
  font-weight: 600;
  font-size: 20px;
  color: #ffffff;
  background-color: #1883ba;
  border-radius: 6px;
  border: 2px solid #0016b0;
}
.boton:hover {
  color: #1883ba;
  background-color: #ffffff;
}
#boton7 {
  cursor: pointer;
}
#boton8 {
  cursor: pointer;
}
#boton9 {
  cursor: pointer;
}
#botonac {
  cursor: pointer;
  padding-left: 18px;
  padding-right: 18px;
}
#boton4 {
  cursor: pointer;
}
#boton5 {
  cursor: pointer;
}
#boton6 {
  cursor: pointer;
}
#operacionpor {
  cursor: pointer;
}
#operaciondivision {
  cursor: pointer;
}
#boton1 {
  cursor: pointer;
}
#boton2 {
  cursor: pointer;
}
#boton3 {
  cursor: pointer;
}
#operacionmas {
  cursor: pointer;
}
#operacionmenos {
  cursor: pointer;
}
#boton0 {
  cursor: pointer;
}
#botoncoma {
  cursor: pointer;
  padding-left: 13px;
  padding-right: 13px;
}
#operacionigual {
  cursor: pointer;
  padding-left: 40px;
  padding-right: 40px;
}