app/assets/stylesheets/components/_ui-datepicker.sass
.ui-datepicker
background: white
+border-radius($border-radius-s)
+box-shadow(0 1px 3px $darken-more)
+micro-clearfix
.ui-datepicker-unselectable, .ui-state-disabled
.ui-state-default
opacity: 0.5
&:hover
background: none
color: gray