So many libs to choose from, like:
I have learned so many useless tricks about CSS, like this one.
You have to use different rules to style placeholder, otherwise, they will be ignored. Also reported by treehouse.
A stylus example to hide the placeholder when the learner class exists
.learner &::-webkit-input-placeholder color white &:-moz-placeholder color white &::-moz-placeholder color white &:-ms-input-placeholder color white