* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Open Sans', sans-serif;
  font-size: 25px;
  font-weight: 300;
}

.wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.wrap > div {
  flex-basis: 500px;
  height: 440px;
  border-radius: 10px;
}

.calc {
  margin: 10px 10px 0;
  background-color: rgb(153,153,153);
  box-shadow: rgba(0,0,0,.8) 0px 3px 8px -3px;
  border: 1px solid rgb(153,153,153);
  overflow: hidden;
}

.display {
  height: 90px;
  color: white;
  text-align: right;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 0 15px 10px 15px;
  font-weight: 300;
  background: linear-gradient(#777, #555);
}

p {
    font-size: 40px;
    white-space: nowrap;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-content: space-around;
}

button {
  border: none;
  border-bottom: 1px solid rgb(153,153,153);
  border-right: 1px solid rgb(153,153,153);
  width: 25%;
  height: 70px;
  background-color: rgb(224,224,224);
}

.operator {
  background-color: rgb(245,146, 62);
  color: white;
  border-right: none;
}

button:active,
button.clicked {
  background-color: rgb(178,178,178);
}

.operator:active,
.operator.clicked {
  background-color: rgb(194,115,47);
}

[data-char='0'],
[data-char='.'],
#equal {
  border-bottom: none;
}

[data-char='0'] {
  width: 50%;
}

.history {
  background: linear-gradient(#eee, #ccc);
  margin: 10px;
  box-shadow:inset rgba(0, 0, 0, 0.1) 0px -3px 8px 0px,
            inset rgba(252,255,255,.2) 0px 3px 8px,
            rgba(0,0,0,.8) 0px 3px 8px -3px;
  padding: 20px;
  color: #555;
  overflow: auto;
}

h1 {
  margin: 0 0 20px;
  font-size: 25px;
  font-weight: 800;
}

.history p {
  font-size: 16px;
  font-weight: 400;
  padding: 5px 0;
  border-bottom: 1px dotted rgb(153,153,153);
}

.history p:first-child {
  padding-top: 0;
}

.clearHistory {
  padding: 0 5px;
  width: auto;
  height: 28px;
  float: right;
  color: #777;
  background-color: transparent;
  font-size: 16px;
  border: none;
  border-radius: 5px;
}

@keyframes decrease {
  from { transform: scale(1); }
  to { transform: scale(0); }
}

.disappear {
  animation: decrease 3s forwards;
}