如何使页面加载时尚未打开下拉菜单

Question

我在确定如何使打开页面时下拉菜单尚未打开时遇到一些问题。我还是个初学者，也许我只是在看它。欢迎任何帮助，不胜感激！

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@import url(https://fonts.googleapis.com/css?family=Fjalla+One);
html
{
	margin: 0;
	padding: 0;
	height: 100%;
	background: #2C3E50;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to top, #4CA1AF, #2C3E50);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to top, #4CA1AF, #2C3E50); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
	-webkit-tap-highlight-color: rgba( 0, 0, 0, 0 );
    font-family: 'Fjalla One', sans-serif;
}

h1
{
	font-family: 'Fjalla One', sans-serif;
	font-size: 24px;
	font-weight: 300;
	margin-top: 20px;
	text-align: center;
    color: white;
}

h1 a { color: #888888; text-decoration: none; }

h1 a:hover { text-decoration: underline; }

.content
{
	position: relative;
	top: 5px;
	width: 250px;
	margin: 0 auto;
}

.admin-panel
{
	background: #F8F8F8;
	width: 240px;
	height: 40px;
	color: #888888;
	border: none;
	border-radius: 3px;
	padding: 0 0 0 10px;
	font: bold 13px Helvetica, sans-serif;
	text-transform: uppercase;
	line-height: 41px;
	cursor: default;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	-o-user-select: none;
	user-select: none;
	margin-bottom: 7px;
	box-shadow: 0 1px 1px rgba( 0, 0, 0, 0.2 );
}

.cog
{
	position: absolute;
	top: 0;
	right: 0;
	padding: 5px;
	margin-top: 5px;
	margin-right: 6px;
	border: none;
	color: #888888;
	font-size: 20px;
}

.admin-text:hover, .cog:hover { cursor: pointer; color: #555555; }

input#toggle { display: none; }
input#toggle ~ .menu { display: block; }
input#toggle:checked ~ .menu { display: none; }

.menu a
{
	display: block;
	background: #F8F8F8;
	width: 240px;
	height: 40px;
	padding: 0 0 0 10px;
	font: bold 13px Helvetica, sans-serif;
	text-transform: uppercase;
	text-decoration: none;
	color: #000000;
	color: rgba( 0, 0, 0, 0.4 );
	line-height: 40px;
	box-shadow: 0 1px 1px rgba( 0, 0, 0, 0.2 );
}

.menu a:nth-child( 2 )
{
	border-top-left-radius: 3px;
	border-top-right-radius: 3px;
}

.menu a:last-child
{
	border-bottom-left-radius: 3px;
	border-bottom-right-radius: 3px;
}

.menu a:hover { color: #555555; }

.menu a:hover > .octicon { color: #555555; }

.icon
{
	float: right;
	margin-top: 10px;
	font-size: 20px;
	color: #000000;
	color: rgba( 0, 0, 0, 0.4 );
	opacity: 0.8;
}

.octicon-person { margin-right: 16px; }
.octicon-graph { margin-right: 11px; }
.octicon-cloud-upload { margin-right: 11px; }
.octicon-pencil { margin-right: 13px; }

.arrow
{
	width: 0;
	height: 0;
	margin-left: 15px;
	border-left: 7px solid transparent;
	border-right: 7px solid transparent;
	border-bottom: 9px solid #F8F8F8;
}

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 <form id="form1" runat="server">
        <h1>Administrator</h1>

<div class="content">
	<div class="admin-panel"><label for="toggle" class="admin-text">Admin Settings</label></div>
	<input type="checkbox" id="toggle"/>
	<label class="cog octicon octicon-gear" for="toggle"></label>
	<div class="menu">
		<div class="arrow"></div>
			<a href="AfsprakenAdmin/indexafsprakenadmin.aspx" style="text-align:center;">Afspraken</a>
			<a href="AfsprakenAdmin/indexafsprakenadmin.aspx" style="text-align:center;">Afspraken</a>
            <a href="AfsprakenAdmin/indexafsprakenadmin.aspx" style="text-align:center;">Afspraken</a>
            <a href="AfsprakenAdmin/indexafsprakenadmin.aspx" style="text-align:center;">Afspraken</a>
		</div>
	</div>
</div>
    </form>

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