* {
  margin: 0;
  padding: 0;
}

.outerdiv {
  height: 750px;
  width: 100%;
  background-color: black;
  display: flex;
  justify-content: center;
  align-items: center;
}
.calc-outer {
  height: 530px;
  width: 370px;
  background-color: black;
  border-radius: 15px;
  border: 2px solid orange;
}
.result-display {
  height: 22%;
  width: 100%;
  border-bottom: 2px solid orange;
  box-sizing: border-box;
  padding: 0px 15px 0px 15px;
  font-size: 4rem;
  overflow-x: auto;
}

.button-design {
  /* padding: 13px 10px 13px 10px; */
  border-radius: 10%;
  background-color: gray;
  font-size: 1.5rem;
  font-weight: 600;
  border: none;
  margin: 20px 10px 10px 10px;
  text-align: center;
  flex: 0 0 15%;
  box-sizing: border-box;
  padding: 10px;
}
.buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.spcl {
  background-color: #2f2f2f;
  color: rgba(255, 255, 255, 0.7);
}
.orng {
  background-color: #ee9406;
  color: black;
}
.result-display {
  color: white;
  display: flex;
  align-items: center;
  justify-content: end;
  font-size: 1.5rem;
}
#plus:disabled,
#min:disabled,
#mul:disabled,
#div:disabled,
#mod:disabled {
  opacity: 0.6;
}