Remove <details> and <summary> tag outline or border.

HTML

<section class="ac-container">
				<div>
					<input id="ac-1" name="accordion-1" type="radio" checked />
					<label for="ac-1">Adults Classes</label>
					<article class="ac-small">
						
           <form class="float btn3" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="YEA57KK6HCLHS"><input type="image" class="ol" src="images/paypal/1.jpg" name="submit" alt="1"></form><form class="float btn3" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="2WBEETH9WWXBU"><input type="image" class="ol" src="images/paypal/2.jpg" name="submit" alt="2"></form><form class="float btn3" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="YKS2LKGJHR8D6"><input type="image" class="ol" src="images/paypal/3.jpg" name="submit" alt="3"></form><form class="float btn3" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="8TPHLXJ2MKVUA"><input type="image" class="ol" src="images/paypal/4.jpg" name="submit" alt="4"></form><br><br><form class="float btn3" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="HXM9DMKRCH39Q"><input type="image" class="ol" src="images/paypal/5.jpg" name="submit" alt="5"></form><form class="float btn3" action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="V5CTYKEFBZPRS"><input type="image" class="ol"...

CSS

.ac-container{
	width: 400px;
	margin: 10px auto 30px auto;
	text-align: left;
}
.ac-container label{
	font-family: Tahoma,Arial,sans-serif,Oswald;
	padding: 5px 20px;
	position: relative;
	z-index: 20;
	display: block;
	height: 30px;
	cursor: pointer;
	color: #777;
	text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
	line-height: 33px;
	font-size: 19px;
	background: #ffffff;
	background: -moz-linear-gradient(top, #ffffff 1%, #eaeaea 100%);
	background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#ffffff), color-stop(100%,#eaeaea));
	background: -webkit-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
	background: -o-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
	background: -ms-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
	background: linear-gradient(top, #ffffff 1%,#eaeaea 100%);
	filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eaeaea',GradientType=0 );
	box-shadow: 
		0px 0px 0px 1px rgba(155,155,155,0.3), 
		1px 0px 0px 0px rgba(255,255,255,0.9) inset, 
		0px 2px 2px rgba(0,0,0,0.1);
}
.ac-container label:hover{
	background: #fff;
}
.ac-container input:checked + label,
.ac-container input:checked + label:hover{
	background: #c6e1ec;
	color: #3d7489;
	text-shadow: 0px 1px 1px rgba(255,255,255, 0.6);
	box-shadow: 
		0px 0px 0px 1px rgba(155,155,155,0.3), 
		0px 2px 2px rgba(0,0,0,0.1);
}
.ac-container label:hover:after,
.ac-container input:checked + label:hover:after{
	
	position: absolute;
	width: 24px;
	height: 24px;
	right: 13px;
	top: 7px;
	background: transparent no-repeat center center;	
  content:"\f078";
   font-family: FontAwesome;
   
    
   
}
.ac-container input:checked + label:hover:after{
	background-image: url(../images/arrow_up.png);
  content:"\f077";
   font-family: FontAwesome;
}
.ac-container input{
	display: none;
}
.ac-container article{
	background: rgba(255, 255, 255, 0.5);
	margin-top: -1px;
	overflow: hidden;
	height: 0px;
	position: relative;
	z-index:...