Add Stylish border for post heding

Step 1 Log in to your blogger account and Click on Template  ->

Step 2 Now click on Edit HTML-> Unfold code  ►

Step 3 Now find ]]></b:skin> by Pressing  Ctrl + F

Step 4 And Paste the below code above ]]></b:skin> and save your template

/* post heding border set
----------------------------------------------- */
h3
{
width:785px;
border:2px solid black;
padding: 6px;
border-radius:10px;
-moz-border-radius:25px;
}
/* End post heding border set
----------------------------------------------- */