Created by: ghost
When @border-radius-base equals 0 compiled css is invalid:
.popover-title {
padding: 8px 14px;
margin: 0;
font-size: 14px;
background-color: #f7f7f7;
border-bottom: 1px solid #ebebeb;
border-radius: -1px -1px 0 0;
}
.panel-heading {
padding: 10px 15px;
border-bottom: 1px solid transparent;
border-top-right-radius: -1;
border-top-left-radius: -1;
}
In border-radius negative values are now allowed. See https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius#Values_2
Use http://lesscss.org/functions/#math-functions-max to avoid this