* {
    box-sizing: border-box;
}

body {
    color: #324D69;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #FDFAFF;
}
p {
    color: #aaa;
    font-size: 10pt;
    margin: 0 auto;
    width: 100%;
    text-align: center
}
a {
    color: #bbb;
}
a:hover {
    color: #999
}
#calc-body {
    width: 400px;
    height: 600px;
    margin: 20px auto;
    border-radius: 10px;
    border: 1px lightgrey solid;
    -webkit-box-shadow: 0 2px 12px 1px rgba(0,0,0,0.1) ;
    box-shadow: 0 2px 12px 1px rgba(0,0,0,0.1) ;
    overflow: hidden;
}
#screen {
    background-color: white;
    height: 175px;
    text-align: right;
    padding: 40px 20px;
}
#sub {
    padding: 35px 0 0 0;
}
#main{
    font-size: 34pt
}
#controls {
    box-shadow: 0px -2px 6px 0px rgba(0,0,0,0.1);
    height: 425px;
    display: grid;
    background: #7abcff;
    background: linear-gradient(to bottom, #7abcff 0%,#60abf8 44%,#4096ee 100%);
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
}

button {
    background: none;
    color: inherit;
    border: none;
    font-size: 20pt;
    transition: all 0.2s;
}
button:hover {
    background: #7abcff !important;
    cursor: pointer;
    font-size: 23pt
}

.clear:hover {
    transition: all 0.2s;
    color: #DE3138;
}
.digit {
    background-color: rgba(255, 255, 255, 0.1);
}
#zero {
    grid-column: 1 / 3;
    grid-row: 5 / 6;
}

#equals {
    background-color: rgba(0, 0, 0, 0.1);
}