css - 响应式导航栏正在下推内容

Question

当导航栏在 Chrome 上处于正常无响应模式(我不确定这是否是正确的术语)并且您向下滚动时， Logo 图像会在您向下滚动时保留在菜单后面。但是，当屏幕宽度缩小并且菜单折叠并且您单击图标展开菜单时，它会将 Logo 图像向下推。在移动设备上查看时，我希望该 Logo 图像保留在菜单后面。

我想我稍后会有一些内容，我确实希望被压低，但我不想压低这个标志。我可以将它作为我正在使用的背景的一部分，但我认为如果我可以将它作为单独的图像进行显示，效果会更好。

https://jsfiddle.net/martonian/Ljd5v3ty/

CSS

#logo {

    width: 50%;
    margin: 80px auto;

}

.topnav {

  background-image: url(http://www.buffettworld.com/images/navmenubg.png);
  background-size: 100%;
  font-family: 'Pathway Gothic One', sans-serif;
  margin-top: 10px;
  position: fixed;
  top: 0;
  width: 100%;
}


.topnav a {
  float: left;  
  display: block;
  color: white;
  text-align: center;
  padding: 14px 25px;
  text-decoration: none;
  font-size: 21px;

}

.topnav .icon {
  display: none;
}

.dropdown {
    float: left;
    overflow: hidden;

}

.dropdown .dropbtn {
    font-size: 21px;    
    border: none;
    outline: none;
    color: white;
    padding: 14px 25px;
    background-color: inherit;
    font-family: inherit;
    margin: 0;

}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;

}

.dropdown-content a {
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: #b1d235;
  color: white;
}

.dropdown-content a:hover {
    background-color: #ddd;
    color: black;
}

.dropdown:hover .dropdown-content {
    display: block;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}

.sticky {
  position: fixed;
  top: 10px;
  width: 100%
}

HTML

<div class="topnav" id="myTopnav">
  <a href="#home">HOME</a>
  <a href="#news">NEWS</a>
  <a href="#news">TOUR</a>
    <div class="dropdown">
    <button class="dropbtn">JIMMY 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
        <a href="#">BIOGRAPHY</a>
        <a href="#">AVIATION</a>
        <a href="#">INCIDENTS</a>
        <a href="#">BUSINESS EMPIRE</a>
        <a href="#">CONTACT JIMMY</a>
    </div>
        </div>
          <div class="dropdown">
    <button class="dropbtn">MUSIC 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
        <a href="#">ALBUMS</a>
        <a href="#">SONGS</a>
        <a href="#">CHART HISTORY</a>
        <a href="#">TRIBUTE BANDS</a>
  </div>
        </div>
        <a href="#about">SET LISTS</a>
        <a href="#about">ABOUT</a>
        <a href="#about">ADVERTISE</a>
        <a href="#about">CONTACT</a>
  <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">&#9776;</a>
</div>


<script>
function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
        x.className += " responsive";
    } else {
        x.className = "topnav";
    }
}
</script>



    <div id="logo">

        <img src="http://www.buffettworld.com/images/logo.png">
    </div>

Answer 1

让你的 tonav 位置绝对化。这在您的 max-width: 600px

媒体查询上

.topnav.responsive {position: absolute;}

希望这有帮助:)

#logo {
	
	width: 50%;
	margin: 80px auto;
	
}

.topnav {

  background-image: url(http://www.buffettworld.com/images/navmenubg.png);
  background-size: 100%;
  font-family: 'Pathway Gothic One', sans-serif;
  margin-top: 10px;
  position: fixed;
  top: 0;
  width: 100%;
}


.topnav a {
  float: left;  
  display: block;
  color: white;
  text-align: center;
  padding: 14px 25px;
  text-decoration: none;
  font-size: 21px;

}

.topnav .icon {
  display: none;
}

.dropdown {
    float: left;
    overflow: hidden;

}

.dropdown .dropbtn {
    font-size: 21px;    
    border: none;
    outline: none;
    color: white;
    padding: 14px 25px;
    background-color: inherit;
    font-family: inherit;
    margin: 0;

}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;

}

.dropdown-content a {
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: #b1d235;
  color: white;
}

.dropdown-content a:hover {
    background-color: #ddd;
    color: black;
}

.dropdown:hover .dropdown-content {
    display: block;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child), .dropdown .dropbtn {
    display: none;
  }
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: absolute;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
  .topnav.responsive .dropdown {float: none;}
  .topnav.responsive .dropdown-content {position: relative;}
  .topnav.responsive .dropdown .dropbtn {
    display: block;
    width: 100%;
    text-align: left;
  }
}

.sticky {
  position: fixed;
  top: 10px;
  width: 100%
}

<div class="topnav" id="myTopnav">
  <a href="#home">HOME</a>
  <a href="#news">NEWS</a>
  <a href="#news">TOUR</a>
    <div class="dropdown">
    <button class="dropbtn">JIMMY 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
		<a href="#">BIOGRAPHY</a>
		<a href="#">AVIATION</a>
		<a href="#">INCIDENTS</a>
		<a href="#">BUSINESS EMPIRE</a>
		<a href="#">CONTACT JIMMY</a>
    </div>
		</div>
		  <div class="dropdown">
    <button class="dropbtn">MUSIC 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
		<a href="#">ALBUMS</a>
		<a href="#">SONGS</a>
		<a href="#">CHART HISTORY</a>
		<a href="#">TRIBUTE BANDS</a>
  </div>
		</div>
		<a href="#about">SET LISTS</a>
  		<a href="#about">ABOUT</a>
		<a href="#about">ADVERTISE</a>
		<a href="#about">CONTACT</a>
  <a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">&#9776;</a>
</div>


<script>
function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
        x.className += " responsive";
    } else {
        x.className = "topnav";
    }
}
</script>
	

	
	<div id="logo">
		
		<img src="http://www.buffettworld.com/images/logo.png">
	</div>