# Contour line opacity

**URL:** <https://community.plotly.com/t/contour-line-opacity/22210>\
**Category:** plotly.js\
**Created:** [April 12, 2019, 7:30am UTC](https://community.plotly.com/t/contour-line-opacity/22210 "2019-04-12T07:30:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![koushikphy](https://avatars.discourse-cdn.com/v4/letter/k/f1d935/32.png) [@koushikphy](https://community.plotly.com/u/koushikphy)\
**Post date:** [April 12, 2019, 7:30am UTC](https://community.plotly.com/t/contour-line-opacity/22210/1 "2019-04-12T07:30:23Z")

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Can I control the opacity of the contour lines in plotly surface plot?

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**Author:** ![etienne](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/etienne/32/17_2.png) [@etienne](https://community.plotly.com/u/etienne)\
**Post date:** [April 12, 2019, 1:16pm UTC](https://community.plotly.com/t/contour-line-opacity/22210/2 "2019-04-12T13:16:51Z")

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Try setting [https://plot.ly/javascript/reference/#contour-line-color](https://plot.ly/javascript/reference/#contour-line-color) to an `rgba` color e.g. `rgba(255,0,0,0.3)` is a semi-transparent red.