css 下拉

夜晚一条狗在空无一人的大街上看着马路对面

<!doctype html>
<html>
<head>
<style>
/*---1-------------------------------------------
            	这里是下拉文字的
-------------------------------------------------*/
.dropdown{ 
    position: relative;
    top:30px;
    left:50px;
    display: inline-block;
}
.dropdown-content{
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    width: 150%;
    overflow:auto;
    box-shadow: 0px 8px 16px 0px rgb(0, 0,0, 0.2);
    padding: 12px 16px;
    z-index: 1;
}
.dropdown:hover .dropdown-content{
    display: block;
}
/*---2-------------------------------------------
            	这里是下拉按钮的
-------------------------------------------------*/
.dropdownbutton{ 
    position: relative;
    top:30px;
    left:50px;
    display: inline-block;
}
.dropbtn{
    background-color: #4caf50;
    color: white;
    position: relative;
    left: 30px;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}
.dropdown-button{
    display:none;
    position: absolute;
    left:30px;
    background-color: #F9F9F9;
    width: 100%;
    box-shadow: 0PX 8PX 16PX 0PX RGBA(0,0,0,0.2);
    z-index: 1;
}
.dropdown-button a{
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}
.dropdownbutton:hover .dropdown-content{
    display: block;
}
.dropdown-button a:hover{background-color: #f1f1f1;}
.dropdownbutton:hover .dropdown-button{
    display: block;
}
.dropdownbutton:hover .dropbtn{
    background-color: #3e8e41;
}
/*---3-------------------------------------------
            	这里是下拉图片的
-------------------------------------------------*/
.dropdownimg {
    position: relative;
    top:50px;
    left: 100px;
    display: inline-block;
}

.dropdown-img {
    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;
}

.dropdownimg:hover .dropdown-img {
    display: block;
}

.desc{
    padding: 15px;
    text-align: center;
}



</style>
</head>
<body>
<div class="dropdown">
    <span>下拉文字</span>
    <div class="dropdown-content">
        <p>这里显示的是下拉的文字</p>
    </div>
</div>

<div class="dropdownbutton">
    <button class="dropbtn">下拉按钮</button>
    <div class="dropdown-button">
        <a href="#">link 1</a>
        <a href="#">link 2</a>
        <a href="#">link 3</a>
    </div>
</div>
<div class="dropdownimg">
    <img src="source/images/1dog.JPG" alt="夜晚一条狗在空无一人的大街上看着马路对面" width="100" height="50">
    <div class="dropdown-img">
            <img src="source/images/1dog.JPG" alt="夜晚一条狗在空无一人的大街上看着马路对面" width="300" height="200">
            <div class="desc">夜晚一条狗在空无一人的大街上看着马路对面</div>
</div>
</div>

</body>
</html>