* {
    box-sizing: border-box;
}

body {
    background-color: #eee;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    margin: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

canvas {
    border: 2px solid navy;
}

.toolbox {
    background-color: navy;
    border: 1px solid steelblue;
    display: flex;
    width: 804px;
    padding: 1rem;
}

.toolbox > * {
    background-color: #fff;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    height: 50px;
    width: 50px;
    margin: .25rem;
    padding: .25rem;
    cursor: pointer;
}

.toolbox > *:last-child{
    margin-left: auto;
}