Add this code to the Custom CSS field on the Settings tab of your Timeline widget’s settings:
.es-action-button {
border-radius: 0px!important;
}
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How do you remove the border radius from the HOVER effect? I thought adding the same style to .es-action-button:hover would work but it doesn’t.
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Hi there, @user3014 and welcome to the Community 
We’ve replaced the previous code with the new one and now everything works fine:
.es-action-button, .es-action-button * {
border-radius: 0px !important;
}
We’ve also noticed that you used dynamic classes in another CSS codes in your widget. We’ve replaced them with the static classes, which work more stable 