Close automatic opened css accordion menu - css

Question

I'm using this accordion for a menu but it has a panel which is open automatically, I'm wondering how I can have it so no panels are open until it is clicked. This is a pure css menu but I can't figure out why it's open automatically.
body {background: #e0e3ec url(http://netcribe.com/example/bgnoise_lg.jpg) repeat top left;}
.ac-container{
width: 400px;
margin: 10px auto 30px auto;
}
.ac-container label{
font-family: 'Arial Narrow', Arial, sans-serif;
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: -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{
content: '';
position: absolute;
width: 24px;
height: 24px;
right: 13px;
top: 7px;
background: transparent url(http://netcribe.com/example/arrow_down.png) no-repeat center center;
}
.ac-container input:checked + label:hover:after {
background-image: url(http://netcribe.com/example/arrow_up.png);
}
.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: 10;
-webkit-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-moz-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-o-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-ms-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
}
.ac-container input:checked ~ article {
-webkit-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-moz-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-o-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-ms-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
box-shadow: 0px 0px 0px 1px rgba(155,155,155,0.3);
height: 100px;
}
.ac-container article p{
font-style: italic;
color: #777;
line-height: 23px;
font-size: 14px;
padding: 20px;
}

Answer 1

change <input id="ac-1" name="accordion-1" type="checkbox" checked />
to <input id="ac-1" name="accordion-1" type="checkbox" />
Remove the checked. It seems the accordion relies on these checkboxes being checked. Remove the checked and it won't open.