.omniauth-login-button {
  position: relative;
  overflow: hidden;
  border-radius: 50%;
  height: 45px;
  width: 45px;
  border-color: blue;
  border-width: 1px;
}

.omniauth-login-button_provider-logo {
  padding: 7px;
  background-color: white;
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
}