Change calendar event background color in SharePoint 2013

This SharePoint 2013 tutorial explains, how to change calendar event background color using CSS in SharePoint 2013.

By default when you create an event in SharePoint 2013/Online calendar, the background color will appear in blue like below:

You can change this background color using CSS. Edit the calendar page and add a script editor web part. To add a script editor web part, edit the page then from the Ribbon click on INSERT -> Web Part -> then from the categories select Media and Content and then choose the Script editor web part.

<style type="text/css">
 .ms-acal-item {
 BORDER-BOTTOM: #ed0033; BORDER-LEFT: #ed0033; BACKGROUND-COLOR: #ed0033; BORDER-TOP: #ed0033; BORDER-RIGHT: #ed0033
 }
 .ms-acal-default-hover {
 BORDER-BOTTOM: #ed0033; BORDER-LEFT: #ed0033; BACKGROUND-COLOR: #ed0033; BORDER-TOP: #ed0033; BORDER-RIGHT: #ed0033
 }
 .ms-acal-apanel-item {
 BORDER-BOTTOM: #00485b; BORDER-LEFT: #ed0033; BACKGROUND-COLOR: #ed0033; BORDER-TOP: #ed0033; BORDER-RIGHT: #ed0033
 }</style>

Then Save the page. Now the background color will appear like below:

You may like following SharePoint Calendar tutorials:

• Hide All Day Event Recurrence fields from a calendar in SharePoint 2013
• Create Calendar Overlays Using Single Calendar App in SharePoint 2013 Online
• Create Calendar Overlays Using Multiple Calendar Apps in SharePoint 2013 Online
• Create Color coded calendar in SharePoint 2013
• SharePoint 2013 Online Remove Time from All Events Calendar view
• SharePoint Online Add Calendar Month Week and Day view as Hyperlink
• Display the Calendar Using Jquery Full Calendar and SharePoint Rest API
• Working with SharePoint Calendar in SharePoint 2016/2013/Online
• SharePoint Online Group Calendar Web Part Tutorial

I hope this will be helpful to change the SharePoint 2013 calendar background color in SharePoint 2013/2016 or SharePoint Online.