Create a circular button in BS3

you can do something like adding a class to add border radius

HTML:

<a href="#" class="btn btn-default btn-circle"><i class="fa fa-user"></i></a>

CSS:

.btn-circle {
  width: 30px;
  height: 30px;
  text-align: center;
  padding: 6px 0;
  font-size: 12px;
  line-height: 1.42;
  border-radius: 15px;
}

in case you wanted to change dimension you need to change the font size or padding accordingly