body{
    background-color: #eee;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

canvas{
    border: 2px solid blue;
}

.tools{
    width: 784px;
    display: flex;
    padding: 10px;
    background-color: steelblue;
}

.tools > * {
    padding: 0.2rem 0.7rem;
    margin: 0.1rem;
    font-size: 1rem;
    background-color: #fff;
    border-width: 0;
    border-radius: 5px;
}
.tools > *:last-child {
    margin-left: auto;
}