How could I make this css dropup menu better?

The css for the dropup menu is:

<style>

  * {
	outline: none;
	padding: 0;
	margin: 0;
}
a {
	outline: none !important;
}
body {
	background-color: #60a3bc;
	color: #555;
	font-size: 1.1em;
	font-family: Arial, Helvetica, sans-serif;
	outline: none;
	padding: 0;
	margin: 0;
}

.header{
	background:#60a3bc;
  text-shadow: 0px 0px 6px rgba(255, 255, 255, 1);
        -webkit-box-shadow: 0px 5px 40px -10px rgba(0, 0, 0, 0.57);
        -moz-box-shadow: 0px 5px 40px -10px rgba(0, 0, 0, 0.57);
  width: 72px;
          margin-left: 1000px;
        margin-top: 30px;
}

nav ul {
	-webkit-font-smoothing: antialiased;
	list-style: none;
	margin: 0;
	padding: 0;
	width: 100%;
}
nav li {
  background:#60a3bc;
	float: left;
	margin: 0;
	padding: 0;
	position: relative;
  position: absolute; /*Drop Up Menu */
  bottom: 50px;
}
nav a {
	color: #444;
	display: block;
	font: normal 24px/50px Arial, Helvetica, sans-serif;
	padding: 0 25px;
	text-align: center;
	text-decoration: none;
	-webkit-transition: all .25s ease;
	-moz-transition: all .25s ease;
	-ms-transition: all .25s ease;
	-o-transition: all .25s ease;
	transition: all .25s ease;
}
nav .dropdown {
	background:url('../images/arrow.jpg') no-repeat right center;
}
nav li:hover a {
	background: #01abf8;
	color:#FFF;
}
nav li ul {
	float: right;
	right: 0;
	width: 150%;
	opacity: 0;
	position: absolute;
	top: 35px;
	visibility: hidden;
	z-index: 1;
	-webkit-transition: all .25s ease;
	-moz-transition: all .25s ease;
	-ms-transition: all .25s ease;
	-o-transition: all .25s ease;
	transition: all .25s ease;
  position: absolute;
  bottom: 50px;
}
nav li:hover ul {
	opacity: 1;
	top: 50px;
	visibility: visible;
}
nav li ul li {
	float: none;
	width: 100%;
}
nav li ul a:hover {
	background: #bbb;
}
/* Clearfix */
.cf:after, .cf:before {
	content: "";
	display: table;
}
.cf:after {
	clear: both;
}
  
    </style>

and the HTML is:

<div class="header">  
        <nav>
            <ul class="cf">
                <li><a class="dropdown" href="#">+</a>
                    <ul>
                        <li><a href="#">1</a></li>
                        <li><a href="#">2</a></li>
                        <li><a href="#">3</a></li>
                    </ul>
                    </li>
            </ul>
        </nav>
    </div>

I want to make the drop down look like a circle, currently it looks like,

image

It looks like that, when I hover over it.

I want it to look something like,

To make buttons circles, you can use border-radius: 100%; in whatever class you need (I can’t tell whether it’s cf or dropdown)

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