CSS3 过渡特性创建信封效果的联系表单

　　最近给大家分享 CSS3 效果比较多，都是充分运用了 CSS3 来实现的。通过 CSS3 的新特性，我们创作出好的交互和效果的可能性大大增加。这篇文章中，我想与大家分享使用 CSS3 过渡特性实现的信封效果的联系表单。

CSS3 代码：

#form_wrap { overflow:hidden; height:446px; position:relative; top:0px;
    -webkit-transition: all 1s ease-in-out .3s;
    -moz-transition: all 1s ease-in-out .3s;
    -o-transition: all 1s ease-in-out .3s;
    transition: all 1s ease-in-out .3s;}
 
#form_wrap:before {content:"";
    position:absolute;
    bottom:128px;left:0px;
    background:url('images/before.png');
    width:530px;height: 316px;}
 
#form_wrap:after {content:"";position:absolute;
    bottom:0px;left:0;
    background:url('images/after.png');
    width:530px;height: 260px; }
 
#form_wrap.hide:after, #form_wrap.hide:before {display:none; }
#form_wrap:hover {height:776px;top:-200px;}
 
 
form {background:#f7f2ec url('images/letter_bg.png'); 
    position:relative;top:200px;overflow:hidden;
    height:200px;width:400px;margin:0px auto;padding:20px; 
    border: 1px solid #fff;
    border-radius: 3px; 
    -moz-border-radius: 3px; -webkit-border-radius: 3px;
    box-shadow: 0px 0px 3px #9d9d9d, inset 0px 0px 27px #fff;
    -moz-box-shadow: 0px 0px 3px #9d9d9d, inset 0px 0px 14px #fff;
    -webkit-box-shadow: 0px 0px 3px #9d9d9d, inset 0px 0px 27px #fff;
    -webkit-transition: all 1s ease-in-out .3s;
    -moz-transition: all 1s ease-in-out .3s;
    -o-transition: all 1s ease-in-out .3s;
    transition: all 1s ease-in-out .3s;}
 
 
    #form_wrap:hover form {height:530px;}
 
    label {
        margin: 11px 20px 0 0; 
        font-size: 16px; color: #b3aba1;
        text-transform: uppercase; 
        text-shadow: 0px 1px 0px #fff;
    }
 
    input[type=text], textarea {
        font: 14px normal normal uppercase helvetica, arial, serif;
        color: #7c7873;background:none;
        width: 380px; height: 36px; padding: 0px 10px; margin: 0 0 10px 0;
        border:1px solid #f8f5f1;
        -moz-border-radius: 5px; -webkit-border-radius: 5px; border-radius: 5px;
        -moz-box-shadow: inset 0px 0px 1px #726959;
        -webkit-box-shadow:  inset 0px 0px 1px #b3a895; 
        box-shadow:  inset 0px 0px 1px #b3a895;
    }   
 
    textarea { height: 80px; padding-top:14px;}
 
    textarea:focus, input[type=text]:focus {background:rgba(255,255,255,.35);}
 
    #form_wrap input[type=submit] {
        position:relative;font-family: 'YanoneKaffeesatzRegular'; 
        font-size:24px; color: #7c7873;text-shadow:0 1px 0 #fff;
        width:100%; text-align:center;opacity:0;
        background:none;
        cursor: pointer;
        -moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; 
        -webkit-transition: opacity .6s ease-in-out 0s;
        -moz-transition: opacity .6s ease-in-out 0s;
        -o-transition: opacity .6s ease-in-out 0s;
        transition: opacity .6s ease-in-out 0s;
    }
 
    #form_wrap:hover input[type=submit] {z-index:1;opacity:1;
        -webkit-transition: opacity .5s ease-in-out 1.3s;
        -moz-transition: opacity .5s ease-in-out 1.3s;
        -o-transition: opacity .5s ease-in-out 1.3s;
        transition: opacity .5s ease-in-out 1.3s;}
 
        #form_wrap:hover input:hover[type=submit] {color:#435c70;}