body {
  background: linear-gradient(145deg, #00334d, #006699);
}
.header {
  text-align: center;
}
.header-title {
  margin: 1.5em 0 0.2em;
  font-family: 'Raleway', sans-serif;
  font-weight: 300;
  font-size: 2.3em;
  color: #e6f2ff;
}
.header-description {
  max-width: 420px;
  margin: 1.5em auto 0;
  font-family: 'Quicksand', sans-serif;
  font-weight: 400;
  font-size: 1em;
  color: #b3e6ff;
}
.header-separator {
  margin: 0 auto 1em;
  width: 200px;
  height: 2px;
  background-color: #ff6600;
  border: none;
}
.calc-container {
  max-width: 280px;
  height: auto;
  margin: 3em auto 2em;
}
.calc {
  padding: 0.3em 0em;
  width: 100%;
  min-height: 425px;
  background-color: #006699;
  box-shadow: 0 10px 80px -20px #333, 0 10px 10px -9px #333;
}
.calc-display {
  width: 240px;
  min-height: 95px;
  margin: 1em auto;
  padding: 0.5em;
  box-sizing: border-box;
  background-color: rgba(230, 247, 255, 0.9);
  border: 1px solid #666;
  font-family: 'Arimo', sans-serif;
  position: relative;
  word-wrap: break-word;
}
input {
  height: 1.1em;
  background-color: transparent;
  border: none;
  text-align: right;
}
textarea {
  background-color: transparent;
  border: none;
  resize: none;
  height: 2.2em;
  text-align: right;
  overflow: hidden;
}
.calc-display__digits-top {
  width: 99%;
  color: #777;
  font-size: 1.1em;
}
.calc-display__digits-bottom {
  width: 92%;
  font-size: 1.4em;
  color: #006699;
  position: absolute;
  right: 0.3em;
  bottom: 0.1em;
}
.calc-buttons {
  width: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  float: left;
}
.calc-button {
  width: 50px;
  max-height: 20px;
  padding: 12px 0;
  margin: 0.35em;
  background-color: #fff;
  color: #006699;
  font-family: 'Arimo', sans-serif;
  text-align: center;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}
.calc-button:active {
  transform: translateY(-1px) scale3d(0.95, 0.95, 0.95);
  box-shadow: 0 10px 6px -4px #666;
}
.calc-button__horizon {
  width: 114px;
  height: 20px;
}
.calc-button__vertical {
  padding: 40px 0;
}
.calc-button__orange {
  background-color: #ff6600;
  color: #fff;
}
.calc-button__operators {
  background-color: #00aaff;
  color: #fff;
  font-weight: bold;
}
.calc-button:nth-last-child(1) {
  margin-top: -51px;
}
.calc-button:nth-last-child(2) {
  margin-top: -51px;
  margin-left: -55px;
}
.footer {
  margin: 4em 0 1em;
  text-align: center;
}
.footer-copyright {
  margin-bottom: 0;
  font-family: 'Quicksand', sans-serif;
  font-weight: 400;
  color: #e6f2ff;
}
.footer-social-btn {
  padding: 0.7em 0;
}
.fa.fa-twitter-square,
.fa.fa-codepen,
.fa.fa-github-square {
  color: #00aaff;
}