body {
    font-family: 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #ffb380, #ff8533);
    background: -webkit-linear-gradient(135deg , #ffb380, #ff8533);
}
h1{
   color: #212F3D;
   text-align: center;
   font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
   
}
#container {
    width: 100%;
    height: 100%;
}

.name {
    color: whitesmoke;
    text-align: center;
}

#calculator {
    width: 320px;
    height: 555px;
    background-color: #1C2833;
    padding-top: -2px;
    padding-bottom: 10px;
    ;
    margin: 0px auto;
    top: 20px;
    position: relative;
    border-radius: 5px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

#result {
    height: 120px;
}

#history {
    text-align: right;
    height: 20px;
    margin: 0 20px;
    padding-top: 20px;
    font-size: 20px;
    color: wheat;
}

#output {
    text-align: right;
    height: 60px;
    margin: 10px 20px;
    font-size: 30px;
    color: wheat;
    font-family: digital-7;
}

#keyboard {
    height: 400px;
}

.operator,
.number,
.empty {
    width: 50px;
    height: 50px;
    margin: 15px;
    float: left;
    border-radius: 50%;
    border-width: 0;
    font-weight: bold;
    font-size: 15px;
    color: white;
}

.number,
.empty {
    background-color: #212F3D;
}

.number,
.operator {
    cursor: pointer;
}

.operator:active,
.number:active {
    font-size: 18px;
}

.operator:focus,
.number:focus,
.empty:focus {
    outline: 0;
}

button:nth-child(1) {
    font-size: 20px;
    background-color: #82E0AA;
}

button:nth-child(2) {
    font-size: 20px;
    background-color: #E59866;
}

button:nth-child(3) {
    font-size: 20px;
    background-color: orange;
}

button:nth-child(4) {
    font-size: 20px;
    background-color: #20b2aa;
}

button:nth-child(8) {
    font-size: 20px;
    background-color: #F1C40F;
}

button:nth-child(12) {
    font-size: 20px;
    background-color: #f08080;
}

button:nth-child(16) {
    font-size: 20px;
    background-color: #7d93e0;
}

button:nth-child(20) {
    font-size: 20px;
    background-color: #9477af;
}