在 Span 中，如何更改文本的颜色

我讨厌靠运气来寻求帮助，但我还是走了——

我从 w3schools.com 得到了这段代码，但无法弄清楚如何使 HTML 代码中的单词 OPEN 变成不同的颜色。它目前是黑色的，我想要白色。我更改了其他颜色，因为我的实际页面有黑色背景。抱歉代码太长了，我觉得太多总比不够好。这是我目前拥有的代码：

HTML

<div id="mySidenav" class="sidenav">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
<a href="#">About</a>
<a href="#">Services</a>
<a href="#">Clients</a>
<a href="#">Contact</a>
</div>

<p>Click on the element below to open the menu</p>
<span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; open</span>

<script>
function openNav() {
document.getElementById("mySidenav").style.width = "250px";
}

function closeNav() {
document.getElementById("mySidenav").style.width = "0";
}
</script>

CSS

body {
font-family: "Lato", sans-serif;
}

.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #DD0;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}

.sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #2707AB;
    display: block;
    transition: 0.3s;
}

.sidenav a:hover {
    color: #818181;
}

.sidenav .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}

谢谢你的帮助！