*{
    box-sizing: border-box;
}
body{
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: sans-serif;
    margin: 0;
    min-height: 100vh;
}
canvas{
    border: 2px solid #74b9ff;
}
.toolbox{
    background-color: #74b9ff;
    border: 1px solid #74b9ff;
    display: flex;
    padding: 1rem;
    width: 704px;
}
.toolbox > *{
    background-color: #fff;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin: 0.25rem;
    padding: 0.25rem;
    width: 30px;
    height: 30px;
    
}
.toolbox > *:last-child{
    margin-left: auto;
}