Answers for "outline curved css"

css round outline

/*A box-shadow can be used for a similar effect*/

.your-box-or-button-class{
box-shadow: 0 0 3px #000000;
}

outline radius css

/* use box-shadow instead of outline radius */
box-sizing: border-box;
border-radius: 100%;
border: 3px solid #dadada;
box-shadow: 0 0 0 2px #fff inset;