styles.css

canvas{
    margin: 0;
    padding: 0;
    z-index: -1;
    width: auto;
    height: auto;
    position: absolute;
    cursor: crosshair;
}

.toolbar-wrapper {
    z-index: 1;
    position: absolute;
    margin-top: 5%;
    margin-left: 3%;
    text-align: center;
    width: 60px;
}

.toolbar-main-menu{
    background-color: #f0f0f0;
    border-radius: 10%;
    border: 1px black;
    padding: 3px;
    margin: 0;
    display: block;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0,0,0,.3);
}

ul{
    list-style-type: none;
    margin: 2px;
    padding: 0;
}

li{
    padding: 5px;
    margin:1px;
    border-radius: 10%;
}

.toolName:hover{
    border-radius: 15%;
     /* box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.19); */
    background-color: #ddd;
}

*, ::after,::before{
    box-sizing: inherit;
}