chrome-extensions-samples/apps/samples/calculator/style.css

html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  margin: 0px;
  padding: 0px;
  width: 100%;
  height: 100%;
  font: bold 16px 'Open Sans', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
  font-weight: 700;
}

::-webkit-scrollbar {
  display: none;
}

::-webkit-scrollbar-thumb {
  display: none;
}

#calc {
  background-color: #fff;
  border: 0;
  margin: 0;
  padding: 0px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

#calc #display,
#calc #display:focus {
  flex: 1 1 100%;
  border: none;
  letter-spacing: 1px;
  line-height: 20px;
  margin: 0px;
  min-width: 204px;
  overflow: scroll;
  padding: 20px;
  width: calc( 100% - 40px );
}

.edge-top {
  height: 5px;
  width: 100%;
  z-index: 99;
  position: absolute;
  background: #fff;
}

.edge {
  background: linear-gradient(to bottom, rgba(255,255,255,1) 0%,
                                         rgba(255,255,255,0) 100%);
  height: 20px;
  position: absolute;
  top: 5px;
  width: 100%;
  z-index: 99;
}

.equation {
  width: 100%;
  position: relative;
  clear: both;
  height: 22px;
}

.equation .operator {
  color: #2c2c2c;
  width: 15px;
  float: right;
  padding-right: 5px;
  height: 22px;
  line-height: 16px;
  padding-top: 3px;
  padding-bottom: 3px;
}

.equation .operand {
  color: #2c2c2c;
  float: right;
  max-width: 80px;
  text-align: right;
  overflow: hidden;
  height: 16px;
  line-height: 16px;
  padding-top: 3px;
  padding-bottom: 3px;
}

.equation .accumulator {
  color: #888;
  float: left;
  font-size: 13px;
  width: 85px;
  max-width: 80px;
  text-align: left;
  overflow: hidden;
  height: 13px;
  line-height: 13px;
  padding-top: 6px;
  padding-bottom: 3px;
}

#display .hr {
  width: 100%;
  height: 0px;
  border-top: 1px solid #d9d9d9;
  position: relative;
}

#calc #buttons {
  flex: 1 1 100%;
  height: 244px;
  width: 100%;
  min-height: 225px;
  min-width: 244px;
}

.button-row {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  flex: 1 1 100%;
}

.button-column {
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  flex: 1 1 100%;
}

.calc-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  cursor: pointer;
  text-align: center;
  color: rgb(202, 202, 202);
  background: linear-gradient(#4B4B4B, #424242);
  box-shadow: inset 1px 1px 0 #636363, inset -1px -1px 0 #141414;
  text-shadow: 1px 1px #222;
  flex: 1 1 100%;
}
.calc-button:active, .calc-button.active {
  background: linear-gradient(#424242, #4B4B4B);
  box-shadow: inset 1px 1px 0 #141414, inset -1px -1px 0 #636363;
}

.calc-button.big {
  font-size: 24px;
}

.calc-button.AC {
}

.calc-button.plus-minus {
}

.calc-button.div {
}

.calc-button.mult {
}
.calc-button.plus {
}
.calc-button.minus {
}
.calc-button.one {
}
.calc-button.two {
}
.calc-button.three {
}
.calc-button.four {
}
.calc-button.five {
}
.calc-button.six {
}
.calc-button.seven {
}
.calc-button.eight {
}
.calc-button.nine {
}
.calc-button.equals {
  flex: 2 1 200%;
  background: linear-gradient(#6BA0FF, #2C76F8);
  box-shadow: inset 1px 1px 0 #84ACF5, inset -1px -1px 0 #175EDA;
}
.calc-button.equals:active, .calc-button.equals.active {
  background: linear-gradient(#2C76F8, #6BA0FF);
  box-shadow: inset 1px 1px 0 #175EDA, inset -1px -1px 0 #84ACF5;
}
.calc-button.zero {
}
.calc-button.point {
}