<body>

<div class="container">

    <form method="post" action="#">

        <div class="input-group">

            <input type="text" placeholder="请告诉我，你在寻找什么" >

            <span class="input-group-btn">

                <button class="btn" type="submit">立即搜索</button>

            </span>

        </div>

    </form>

</div>

</body>

@charset "utf-8";

/* CSS Document */

body{padding:; margin:; font-size:16px;}

input{ border:; outline:;} 

/* 设置外部容器样式 开始 使用媒体查询以兼容各种设备*/

.container{ width:100%; }

@media(min-width:800px) and (max-width:1280px){.container{ width:65%;}}

@media(min-width:1281px){.container{ width:45%;}}

/* 设置外部容器样式 结束 */

/*设置表单组中输入框的样式*/

.input-group{ width:90%; margin:5%; }

.input-group input { height:3em; line-height:3em; width:66%;  border:1px solid #cccccc; border-top-left-radius:1.5em;/*设置左上角的边框*/

                        border-bottom-left-radius:1.5em;/*控制左下边的边框*/padding-left:1.2em; font-size:14px;}

@media(min-width:800px) and (max-width:1280px){.input-group input{ height:3em; line-height:3em; font-size:22px;}}

/* 设置按钮样式的内边距 */

.btn{width:27%; float:right;}

/* 设置表单组中按钮的样式 */

.input-group .input-group-btn .btn{

    height:2.9em;

    border:1px solid #cccccc;

    border-top-right-radius:1.5em;

    border-bottom-right-radius:1.5em;

    border-left:none;

    color:white;

    /*text-shadow:0 0 2px #fff, 0 0 4px #fff, 0 0 60px #fff, 0 0 8px #ff00de, 0 0 10px #ff00de, 0 0 12px #ff00de, 0 0 14px #ff00de, 0 0 16px #ff00de;*/

    font-family: "微软雅黑"; text-align:center; color:#fff; text-shadow:3px 3px 3px red;

    font-size:16px;

}

@media(min-width:800px) and (max-width:1280px){.input-group .input-group-btn .btn{ height:2.7em; line-height:2.7em; font-size:26px;}}

@media(min-width:1281px){.input-group .input-group-btn .btn{height:2.3em; line-height:2.3em; font-size:20px; }}

/*设置表单组元素统一向左浮动    即让输入框和按钮和在一起*/

.input-group input,.input-group button{float:left;}

/* 定义动画帧 开始 */

@-webkit-keyframes glow {

    0% {

        border-color: #cccccc;

        box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);

    }

    100% {

        border-color: #66FFFF;

        box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);

    }

}

@-moz-keyframes glow {

    0% {

        border-color: #cccccc;

        box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);

    }

    100% {

        border-color: #66FFFF;

        box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);

    }

}

@-o-keyframes glow {

    0% {

        border-color: #cccccc;

        box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);

    }

    100% {

        border-color: #66FFFF;

        box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);

    }

}

@-ms-keyframes glow {

    0% {

        border-color: #cccccc;

        box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);

    }

    100% {

        border-color: #66FFFF;

        box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);

    }

}

@keyframes glow {

    0% {

        border-color: #cccccc;

        box-shadow: 0 0 5px rgba(102,153,255,.2), inset 0 0 5px rgba(102,153,255,.1);

    }

    100% {

        border-color: #66FFFF;

        box-shadow: 0 0 20px rgba(102,153,255,.6), inset 0 0 10px rgba(102,153,255,.4);

    }

}

/* 定义动画帧 结束 */

/*当表单组中组件获得焦点的时候，执行动画*/

.input-group input:focus,

.input-group .input-group-btn .btn:focus{

    outline:none;

    /*参数依次是：动画名称，完成整个动画所需的时间，规定动画的速度曲线（这里时以低速结束动画），动画播放的次数（值可以是数值，这里时无限）,完成一个周期后是否能逆向播放动画*/

    -webkit-animation: glow 800ms ease-out infinite alternate;

    -moz-animation: glow 800ms ease-out infinite alternate;

    -o-animation: glow 800ms ease-out infinite alternate;

    -ms-animation: glow 800ms ease-out infinite alternate;

    animation: glow 800ms ease-out infinite alternate;

}