SVG icon

icons

https://www.iconfinder.com/

https://material.io/icons/

SVG in CSS masks

此作法，目前已知IE有問題

.vdm-icon {
  display: inline-block;
  width: 35px;
  height: 35px;
  background-color: red;
  -webkit-mask:  url(i-1.svg) no-repeat 50% 50%;
  mask: url(i-1.svg) no-repeat 50% 50%;
}

https://codepen.io/noahblon/post/coloring-svgs-in-css-background-images

https://css-tricks.com/using-svg/