index.css

html, body {
    height: 100%;
    width: 100%;
}

#editor {
    width: 100%;
    height:100%;
    position: relative;
}

#go {
    display: inline-block;
    width: 100px;
    height: 30px;
    border: 2px solid #FF69B4;
    background-color: #FF69B4;
    border-radius: 20px;
    text-align: center;
    line-height: 20pt;
    font-family: monospace;
    font-weight: 900;
    cursor: pointer;
    margin: 10px;
}

#go:hover{
    background-color: #69ffb4;
}

#stop {
    display: inline-block;
    width: 100px;
    height: 30px;
    border: 2px solid #E6402C;
    background-color: #E6402C;
    border-radius: 20px;
    text-align: center;
    line-height: 20pt;
    font-family: monospace;
    font-weight: 900;
    cursor: pointer;
    margin: 10px;
}

#stop:hover {
    background-color: #2cd2e6;
}