ACP -> Look & Feel -> Manage Skin Sets & Templates -> Your Skin -> CSS -> ipb_styles.css Find: .ipsUserPhoto { padding: 1px; border: 1px solid #d5d5d5; background: #fff; /*-webkit-box-shadow: 0px 2px 2px rgba(0,0,0,0.1); -moz-box-shadow: 0px 2px 2px rgba(0,0,0,0.1); box-shadow: 0px 2px 2px rgba(0,0,0,0.1); -webkit-border-radius: 3px; -moz-border-radius: 3px; border-radius: 3px;*/} .ipsUserPhotoLink:hover .ipsUserPhoto { border-color: #C5C5C5; } .ipsUserPhoto_variable { max-width: 155px; } .ipsUserPhoto_large { max-width: 90px; max-height: 90px; } .ipsUserPhoto_medium { width: 50px; height: 50px; } .ipsUserPhoto_mini { width: 30px; height: 30px; } .ipsUserPhoto_tiny { width: 20px; height: 20px; } .ipsUserPhoto_icon { width: 16px; height: 16px; }And replace with: .setRoundedAvatars .ipsUserPhoto { -webkit-border-radius: 100px; border-radius: 100px;} a.userNavPhoto:hover, .ipsUserPhotoLink:hover .ipsUserPhoto { opacity: 0.8; } .ipsUserPhoto_variable { max-width: 155px; } .ipsUserPhoto_large { max-width: 94px; max-height: 94px; } .ipsUserPhoto_medium { width: 54px; height: 54px; } .ipsUserPhoto_mini { width: 34px; height: 34px; } .ipsUserPhoto_tiny { width: 24px; height: 24px; } .ipsUserPhoto_icon { width: 20px; height: 20px; }