*{margin:0; padding:0;}
html,body{width:100%; height:100%; overflow: hidden;}
.main{
    margin: auto;
    height: 100%;
    background: url(images/bg.jpg) repeat-y;
    background-position-y: 0px;
    width: 480px;
    position: relative;
}
.options{
    position: absolute;
    list-style: none;
    margin: auto;
    left: 0; right: 0; top: 100px; 
    width: 200px;
    height: 300px;
}
.options li{
    border-radius: 5px;
    box-shadow: 0 0 2px 1px black;
    float: left;
    width: 200px;
    height: 75px;
    text-align: center;
    line-height: 75px;
    margin-bottom: 20px;
    background: #f40;
    color: white;
    font: "微软雅黑";
    font-size: 28px;
    cursor: pointer;
}
.logo{
    position: absolute;
    left: 0; right: 0; top: 25%; 
    margin: auto;
    width: 428px; height: 104px;
    background: url(images/logo.png) no-repeat; 
}
.loading{
    position: absolute;
    left: 0; right: 0; top: 60%;
    margin: auto;
    width: 192px; height: 41px;
    background: url(images/loading1.png) no-repeat;
}
.my-warplain{
    position: absolute;
    width: 98px; height: 122px;
    background: url(images/me.png) no-repeat;
    /* cursor: none; */
}
.bullet{
    position: absolute;
    width: 7px; height: 18px;
    background: url(images/bullet.png) no-repeat;
}
.bullet_die{
    position: absolute;
    width: 41px; height: 39px;
    background: url(images/die1.png) no-repeat;
    margin-left: -18px;
}
.enemy-small{
    position: absolute;
    z-index: 1;
    width: 59px; height: 36px;
    background: url(images/plane1.png) no-repeat;
}
.enemy-middle{
    position: absolute;
    width: 70px; height: 92px;
    background: url(images/plane2.png) no-repeat;
}
.enemy-large{
    position: absolute;
    width:165px; height: 256px;
    background: url(images/plane3.png) no-repeat;
}