I'm getting an indentation error in my styl file

I'm new to node and stylus. I have this .styl file that I wrote but I am getting a error saying expected "indent" got "outdent".

style.styl

html , body
  height: 100%
  width: 100%
  background-color: #ffffff
  color: #909DBD

body
  padding: 50px
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif
a
  color: ##909DBD
a:hover, a.active, a:visited
  color: #C4CCA2

.wrapper
  width: 65%
  min-height: 80%
  display block
  margin 0 auto

ul
  list-style none
  display block