html - css tricks for background image blur -


i want blur background image has made content blur , tried set z-index guess not working here html , need solution explanation please:

    <!doctype html> <html> <head>     <title>student-login</title>     <link href='http://fonts.googleapis.com/css?family=shadows+into+light' rel='stylesheet' type='text/css'>     <link rel="stylesheet" type="text/css" href="main.css"> </head> <body>     <div class="body">         <div class="main-form">             <h1>student login</h1>             <form class="login">                 <input type="text" placeholder="*user name" name="user_name"></input><br>                 <input type="password" placeholder="*password" name="user_name"></input><br>                 <input type="button" value="login"></input><br>                 <div class="button"><a href="register.html">register</a></div>             </form>         </div>     </div> </body> </html>

here css file:

.body{              position: absolute;             top: -20px;             left: -20px;             right: -40px;             bottom: -40px;             width: auto;             height: auto;             background-image: url("background.jpg");             background-size: cover;             -webkit-filter: blur(5px);             filter:blur(5px);             z-index: 0; } h1{     font-family: 'shadows light', cursive;     color: #282828;     text-align: center;     margin: 2%; } .main-form{     float: right;     margin-top: 3%;     height:auto;     border-radius: 3px;     background:#f0f0f0;     opacity: .6;     padding-top: 1%;     padding-left: 4%;     padding-right: 4%;     padding-bottom: 1%;     z-index: 1; } .login input[type="text"]{      width: 260px;     height: 35px;     border-radius: 2px;     border: 1px solid #505050 ;     background: transparent;     margin: 2%; } .login input[type="text"]:focus{      border: 1px solid #0033ff; }  .login input[type="password"]{      width: 260px;     height: 35px;     border-radius: 2px;     border: 1px solid #505050 ;     background: transparent;     margin: 2%; } .login input[type="password"]:focus{      border: 1px solid #0033ff; }  .login input[type="button"]{      width: 265px;     height: 35px;     border-radius: 2px;     border: 1px solid #505050 ;     background: transparent;     margin: 2%;     font-family: 'shadows light', cursive;     font-size: 100%;     font-weight: bold; } .login input[type="button"]:hover{      background-color: #404040;     color: white; } .button {      width: 270px;     height: 35px;     border-radius: 2px;     border: 1px solid #505050 ;     background: transparent;     margin: 2%;     font-family: 'shadows light', cursive;     font-size: 100%;     font-weight: bold;     text-decoration: none;     color:black;     text-align: center; } .button a{      font-family: 'shadows light', cursive;     font-size: 100%;     font-weight: bold;     text-decoration: none;     color:black;     text-align: center; } .button:hover{      background-color: #404040; } .button:hover a{      color: white; }  .login select{      width: 265px;     height: 35px;     border-radius: 2px;     border: 1px solid #505050 ;     background: transparent;     margin: 2%;     font-family: 'shadows light', cursive;     font-size: 100%;     font-weight: bold; } .login select:hover{      background-color: #404040;     color: white; } ::-webkit-input-placeholder {    color: red; } :-moz-placeholder { /* firefox 18- */    color: red;   }  ::-moz-placeholder {  /* firefox 19+ */    color: red;   }  :-ms-input-placeholder {      color: red;   }

i believe firefox's 3ddomviewer illustrate whats going on here. moreover, trying blur being applied main-form id b/c child of body div applying to. now, why z-index not working (****crackes knuckles****). okay, z-index works on elements have position! in main-form div position isn't set once give position , set z-index large negative number disappear being hidden of other elements stacked on top of it. see this article more info. hope helps.


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