javascript - 如何让我的汉堡包菜单图标位于我的横幅图片之上？

Question

我在将汉堡包图标置于横幅图片顶部时遇到了问题。我试过调整 z-index，将导航背景颜色设置为透明，并将背景图像放在标题而不是横幅部分。我不知道要采取什么其他步骤。任何建议将不胜感激。

function openNav() {
    document.getElementById("main-nav").style.height = "100%";
}

function closeNav() {
    document.getElementById("main-nav").style.height = "0%";
}

/*Nav*/
header {
  background-color: transparent;
}

.overlay {
  height: 0%;
  width: 100%;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #567E3A;
  overflow-y: hidden;
  transition: 0.5s;
}

.overlay-content {
  position: relative;
  top: 25%;
  width: 100%;
  text-align: center;
  margin-top: 30px;
}

.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #fff;
  display: block;
  transition: 0.3s;
}

.overlay a:hover,
.overlay a:focus {
  color: #7F8C8D;
}

.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

.burger {
  font-size: 2em;
  cursor: pointer;
}



/*Banner*/

#banner {
  background-image: url("http://res.cloudinary.com/dboauovcs/image/upload/c_scale,w_2000/v1521182602/camp3_xhp0d9.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  height: 100vh;
  width: 100%;
  display: grid;
}

.banner-text {
  margin: auto;
  text-align: center;
  color: #fff;
}

.banner-text h1 {
  margin: 2em 1.4em 1.4em 1.4em;
  font-size: 2em;
  line-height: 1.8;
  color: #fff;
  text-shadow: 3px 3px #000;
}

<header>
        <nav id="main-nav" class="overlay">
            <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
            <div class="overlay-content">
                <a href="#">Destinations</a>
                <a href="#">Accomidation</a>
                <a href="#">Stories</a>
                <a href="#">Contact</a>
            </div>
        </nav>

        <span class="burger" onclick="openNav()">&#9776;</span>
    </header>



    <section id="banner">
        <div class="banner-text">
            <h1>Lorem Lipsum</h1>
            <a href="#" class="btn">Book Today</a>
        </div>
    </section>

Answer 1

像这样？

function openNav() {
    document.getElementById("main-nav").style.height = "100%";
}

function closeNav() {
    document.getElementById("main-nav").style.height = "0%";
}

/*Nav*/
header {
  background-color: transparent;
}

.overlay {
  height: 0%;
  width: 100%;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: #567E3A;
  overflow-y: hidden;
  transition: 0.5s;
}

.overlay-content {
  position: relative;
  top: 25%;
  width: 100%;
  text-align: center;
  margin-top: 30px;
}

.overlay a {
  padding: 8px;
  text-decoration: none;
  font-size: 36px;
  color: #fff;
  display: block;
  transition: 0.3s;
}

.overlay a:hover,
.overlay a:focus {
  color: #7F8C8D;
}

.overlay .closebtn {
  position: absolute;
  top: 20px;
  right: 45px;
  font-size: 60px;
}

.burger {
  font-size: 2em;
  cursor: pointer;
  position: absolute;
}



/*Banner*/

#banner {
  background-image: url("http://res.cloudinary.com/dboauovcs/image/upload/c_scale,w_2000/v1521182602/camp3_xhp0d9.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  height: 100vh;
  width: 100%;
  display: grid;
}

.banner-text {
  margin: auto;
  text-align: center;
  color: #fff;
}

.banner-text h1 {
  margin: 2em 1.4em 1.4em 1.4em;
  font-size: 2em;
  line-height: 1.8;
  color: #fff;
  text-shadow: 3px 3px #000;
}

<header>
        <nav id="main-nav" class="overlay">
            <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
            <div class="overlay-content">
                <a href="#">Destinations</a>
                <a href="#">Accomidation</a>
                <a href="#">Stories</a>
                <a href="#">Contact</a>
            </div>
        </nav>

        <span class="burger" onclick="openNav()">&#9776;</span>
    </header>



    <section id="banner">
        <div class="banner-text">
            <h1>Lorem Lipsum</h1>
            <a href="#" class="btn">Book Today</a>
        </div>
    </section>

关于我在这里所做的事情的一些解释(假设这是您正在寻找的治疗方法):positioning the hamburger as absolute ，我们将它完全拉出静态布局流，所以其他元素在定位时忽略它的存在。然后可以使用 left 控制元素的位置。 , right , top和 bottom , 并将相对于绝对定位的第一个祖先元素定位自身，如果没有绝对定位的元素，则相对于 body 。您可能需要考虑使用这些属性调整定位，因为您可能不希望依赖浏览器使用默认值计算其位置。