:root {
    --pattern-size:-80px;
}
body {
    background: linear-gradient(135deg, currentColor 25%, transparent 25%) var(--pattern-size) 0,
    linear-gradient(225deg, currentColor 25%, transparent 25%) var(--pattern-size) 0,
    linear-gradient(315deg, currentColor 25%, transparent 25%),
    linear-gradient(45deg, currentColor 25%, transparent 25%);
    background-size: calc(2 * (var(--pattern-size) * -1)) calc(2 * (var(--pattern-size) * -1));
}
#pattern {
    position:absolute;
    width:100%;
    height:100%;
    background-color:#8938bc;
    background-image: linear-gradient(0deg, transparent 90%, rgb(144, 57, 192) 10%);
    background-size: 100px 3px;
    opacity:0.98;
}
canvas {
    position:relative;
    display:block;
    margin:100px auto 0;
    background-color:#efefef;
    border:50px solid #353535;
    border-radius:20px;
    z-index:1;
    box-shadow: 0 3px 5px 4px rgb(0 0 0 / 20%),
    0 5px 8px 0 rgb(0 0 0 / 14%),
    0 1px 14px 0 rgb(0 0 0 / 12%);
}
#button-group {
    display:block;
    text-align:center;
}
#button-group > div {
    position:relative;
    top:-20px;
    margin:0 auto;
    padding:40px 45px 25px 45px;
    width:525px;
    background-color:#EB686C;
    border-bottom:20px solid #cf565a;
    border-bottom-left-radius:30px;
    border-bottom-right-radius:30px;
    box-shadow: 0 3px 5px 4px rgb(0 0 0 / 10%),
    0 5px 8px 0 rgb(0 0 0 / 8%),
    0 1px 14px 0 rgb(0 0 0 / 6%);
}
button {
    width:110px;
    height:70px;
    padding:10px 30px;
    border:none;
    border-radius:50px;
    font-size:14px;
    font-weight:bold;
    box-shadow: inset 7px -1px 0px -54px #c74f52, 5px 5px 5px 1px #c5484c;
    -webkit-box-shadow: inset 7px -1px 0px -54px #c74f52, 5px 5px 5px 1px #c5484c;
    cursor:pointer;
}
button#start {
    margin-right:100px;
    background-color:#fdc600;
    border-bottom:solid 10px #d7aa08;
    color:#b99200;

    box-shadow:inset 7px -1px 0px -54px #c74f52, 5px 5px 5px 1px #c5484c;
    -webkit-box-shadow:inset 7px -1px 0px -54px #c74f52, 5px 5px 5px 1px #c5484c;
}
button#reset {
    background-color:#5e72ff;
    border-bottom:solid 10px #5063e5;
    color:#3c49ad;
}