body {
  margin: 0;
  width: 100%;
  color: rgba(0, 0, 0, 0.8);
  background: rgba(255, 255, 255, 0.8);
}
.display {
  border-bottom: 3px solid rgba(0, 0, 0, 0.1);
  margin: 0 auto;
  width: 99%;
  height: 125px;
  background: rgba(230, 230, 230, 0.6);
  border: 6px solid #d0d0d0;
  border-radius: 12px;
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}
.pre-scrollable {
  overflow: scroll;
  margin: 2% auto;
}
.buttons {
  width: 100%;
  margin: auto 0%;
  padding: 1% 0;
  background: #d0d0d0;
}
.R1,
.R2,
.R3,
.R4,
.R5 {
  margin: 4px 5% auto;
  margin-bottom: 5px;
}
button {
  font-size: 75px;
  color: rgba(0, 0, 0, 0.8);
  background: rgba(255, 255, 255, 0.8);
  border: 0;
  width: 24%;
  padding: 0;
}
button:hover {
  background: #333;
  color: #fff;
  box-shadow: 0px 0px 9px 1px #5d5d5d;
}
.calc {
  margin: 0 4%;
  padding: 9px;
}
p {
  font-size: 100px;
}

.link {
  width: -webkit-fill-available;
  margin: auto;
  display: flex;
  margin-top: 1rem;
  margin-bottom: 1rem;
  justify-content: center;
}

.link a {
  font-size: larger;
  font-weight: 700;
}

@media (max-width: 1024px) {
  .display {
    width: 97.6%;
    height: 310px;
    border: 7px solid #d0d0d0;
  }
  .calc {
    margin: 4%;
    padding: 10px;
  }
  p {
    font-size: 250px;
  }
  button {
    font-size: 75px;
    padding: 2%;
  }
}
@media (max-width: 425px) {
  .display {
    width: 97%;
    height: 100px;
    padding: 5% 0;
  }
  .calc {
    margin: 3%;
    padding: 6% 0;
  }
  p {
    font-size: 80px;
  }
  button {
    font-size: 45px;
    width: 23%;
    padding: 0;
    margin: 2% auto;
  }
}