容器内其他项目的不透明度控制

Question

我发现自己在控制容器内项目的不透明度时遇到了问题。该容器应该是唯一一个透明的容器，但不幸的是，即使我已经建立了不透明度，我容器内的所有项目都开始变得透明：1；给他们。

这是我的代码...

HTML

    <!DOCTYPE html>
<html>
<head>
    <title>Dino-Jump</title>
    <link rel="stylesheet" type="text/css" href="style.css">
    <meta name = "viewport" content = "width=device-width, initial-scale=1.0">
</head>
<body class = "bg">
<div id = container>
<img src="Pics/user.jpg" id = "user">
<form action = "action-login">
    <div id = "login-box">
        <h1 class = "label1">Login</h1>
        <div class = "textbox">
        <i class = "fa fa-user" aria-hidden = "true"></i>
        <input type="text" name="uname" placeholder="Username" required = "true">
        </div>
        <div class = "textbox">
        <i class = "fa fa-lock" aria-hidden = "true"></i>
        <input type="password" name="pword" placeholder="Password" required = "true">
        </div>

        <input class = "btn" type = "button" name = "login" value = "Login">
        <a id = "forget" href=""> Forget Password </a>
        <a id = "reg" href=""> Register </a>
</form>
</div>
</div>
    <img src="Pics/title.png" id="game-title">

    <div class = "footer">
        <p>&#169; Copyrights Dino-Jump ZRH.Group 10.20.20.18.2.37</p>
    </div>
    </body>
</html>

CSS

    /**Style**/
@import "https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css";
@media screen and (min-width:768){
    .bg{
        width: 100%;
        margin: 0 auto;
        padding: 0 auto;
        display: block;
        font-family: sans-serif;
        background-image: url("Pics/bg.jpg");
        background-repeat: no-repeat;
        background-size: 100%;
    }
    img{
        width: 100%;
    }
}

/**bofy**/
.bg{
     margin: 0 auto;
     padding: 0 auto;
     font-family: sans-serif;
     background-image: url("Pics/bg03.jpg");
     background-repeat: no-repeat;
     background-size: 100%;
}
#user{

    opacity: 1;
    background-image: url("Pics/user.jpg");
    width: 135px;
    height: 135px;
    margin: 0 auto;
    padding: 0 auto;
    border-radius: 50%;
    border: 4px solid #ffbd04;
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}
#container{
    opacity: 0.5;
    margin: 0 auto;
    padding: 0 auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 380px;
    height: 480px;
    background: #000;
    border: 4px solid #ffbd04;
    border-radius: 20px;
}
#login-box{
    opacity: 1;
    width: 280px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    color: #fff;
}
#login-box h1{
    float: left;
    font-size: 40px;
    border-bottom: 4px solid #ffbd04;
    margin-bottom: 50px;
    padding: 13px 0;
}
.textbox{
    width: 100%;
    overflow: hidden;
    font-size: 20px;
    padding: 8px 0;
    margin: 8px 0;
    border-bottom: 1px solid #ffbd04;
}
.texbox i{
    width: 26px;
    float: left;
    text-align: center;
}
.textbox input{
    border: none;
    outline: none;
    background: none;
    color: #fff;
    font-size: 18px;
    width: 80%;
    float: left;
    margin: 0 10px;
}
::placeholder {
    color: #fff;
}
[placeholder]:focus::-webkit-input-placeholder {
  transition: text-indent 0.3s 0.3s ease; 
  text-indent: -100%;
  opacity: 1;
}
.btn{
    width: 100%;
    background: none;
    border: 2px solid #ffbd04;
    border-radius: 10px;
    color: #fff;
    padding: 5px;
    font-size: 18px;
    margin: 12px;
    transition: .6s;
    overflow: hidden;
}
.btn:focus{
    outline: none;
}
.btn:before{
    content: '';
    display: block;
    position: absolute;
    background: rgba(255,255,255,.5);
    opacity: 0.5;
    filter: blur(30px);
    transform: translateX(-130px) skewX(-15deg);
}
.btn:after{
    content: '';
    display: block;
    position: absolute;
    background: rgba(255,255,255,.5);
    opacity: 0;
    filter: blur(30px);
    transform: translate(-100px) scaleX(-15deg);

}
.btn:hover{
    background: #ffbd04;
    cursor: pointer;
}
.btn:hover:before{
    transform: translateX(300px) skewX(-15deg);
    opacity: 0.6;
    transition: 0.7s;
}
.btn:hover:after{
    transform: translateX(300px) skewX(-15deg);
    opacity: 1;
    transition: 0.7s;
}
/**Footer**/
.footer{
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: #000;
    color: #fff;
    text-align: left;
    font-size: 8px;
}
#game-title{
    width: 130px;
    height: 40px;
    position: absolute;
    top: 91%;
    left: 50%;
    transform: translate(-50%,-50%);
}
#forget{
    text-decoration: none;
    position: absolute;
    top: 110%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #ffbd04;
    font-size: 12px;
    font-family: sans-serif;
}
#reg{
    text-decoration: none;
    position: absolute;
    top: 110%;
    left: 50%;
    transform: translate(-50%, -190%);
    color: #ffbd04;
    font-size: 12px;
    font-family: sans-serif;
}

很抱歉 post 并提前致谢。

Answer 1

您已将 opacity:0.5 提供给容器 class，将 opacity:1 提供给 child class。不要将不透明度设置为 parent class，而是将 rgba 格式的背景颜色用于容器 class 并删除不透明度

背景：rgba(0, 0, 0, 0.5);

如果将不透明度设置为 parent class，则即使将高不透明度设置为 child，child class 也没有效果。

Answer 2

我使用 !important 关键字得到了一些结果。

#login-box{
opacity: 1 !important;
width: 280px;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
background: #fff !important;

}

您看不到文字，但您或许可以从那里得到您想要的。

Answer 3

先生，方法不对。这是子元素的默认行为。一旦将其设置为父元素，就不能将 opacity:1 设置为子元素。

你有很多方法可以做到这一点。但是由于您正在使用背景颜色并寻找不透明度，我建议使用 background:rgba(0,0,0,0.5) 的最简单方法。这表明背景颜色为 #333，opacity 为 0.5.

详细了解 rgba() here。

#container{
 /*opacity: 0.5;*/    //remove this line
 margin: 0 auto;
 padding: 0 auto;
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%,-50%);
 width: 380px;
 height: 480px;
 /*background: #000;*/     //remove this line 
 border: 4px solid #ffbd04;
 border-radius: 20px;
 background:(0,0,0,0.5);   //newly added line
}

容器内其他项目的不透明度控制

Opacity Control Over other Items Inside the container

html

css

opacity