*,
::after,
::before{
    box-sizing: border-box;
}
body{
    margin: 0;
    padding: 0;
    min-height: 100vh;
    height: auto;
}

#wrapper{
    width: 60%;
    margin: 1rem auto;
}

#wrapper h2{
    text-align: center;
}

#wrapper #myCanvas{
    width: 100%;
    min-height: 200px;
    border: 0.1rem solid #333;
    position: relative;
    padding: 1rem;
}

#wrapper #myCanvas .left-top{
    position: absolute;
    top: 0;
    left: 0;
    border-top-right-radius: 50%;
    transform: rotate(90deg);
    width: 75px;
    height: 75px;
    background: #09e;
}
#wrapper #myCanvas .right-top{
    position: absolute;
    top: 0;
    right: 0;
    border-top-right-radius: 50%;
    transform: rotate(180deg);
    width: 75px;
    height: 75px;
    background: #09e;
}
#wrapper #myCanvas .left-bottom{
    position: absolute;
    bottom: 0;
    left: 0;
    border-top-right-radius: 50%;
    transform: rotate(360deg);
    width: 75px;
    height: 75px;
    background: #09e;
}
#wrapper #myCanvas .right-bottom{
    position: absolute;
    right: 0;
    bottom: 0;
    border-top-right-radius: 50%;
    transform: rotate(270deg);
    width: 75px;
    height: 75px;
    background: #09e;
}

#wrapper #myCanvas .canvasText{
    position: absolute;
    top: 50%;
    width: 100%;
    transform: translate(0, -50%);
    text-align: center;
    transform-origin: center center;
    font-size: 2.8rem;
    font-weight: 900;
    letter-spacing: 1rem;
}

.button-list{
    margin-top: 1rem;
}

button{
    outline: none;
    border: none;
    background: #e74c3c;
    cursor: pointer;
    padding: 1rem;
    appearance: none;
    -moz-appearance: none;
    transition: 0.3s linear;
}
button:hover,
button:focus{
    color: #fff;
    background: #000;
}