* {
    margin: 0;
    padding: 0;
    font-family: "Microsoft yahei", serif;
}
li {
    list-style-type: none;
}
body {
    overflow: hidden;
    user-select: none;
    -moz-user-select: -moz-none;
    -ms-user-select: none;
}
#box {
    position: relative;
    width: 512px;
    height: 768px;
    margin: 20px auto;
}
#map {
    overflow: hidden;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("../img/bg_1.png");
    background-size: 100% 100%;
}
#level {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    width: 100%;
    height: 100%;
}
#level h1 {
    font-size: 40px;
    padding-top: 60px;
    padding-bottom: 150px;
    line-height: 60px;
    text-align: center;
    color: #fff;
}
#level p {
    margin: 130px auto;
    width: 200px;
    height: 50px;
    line-height:50px;
    text-align: center;
    background: #fff;
    font-weight: bolder;
    cursor: pointer;
}
#level p:hover {
    background: #ffa80c;
    color: #fff;
}
#map .plane, #map .biu, #map .enemy, #map .boom, #map .boom2 {
    position: absolute;
}
#map .plane {
    z-index: 8;
}
#map .biu {
    z-index: 10;
}
#map .boom2 {
    z-index: 11;
    animation: bling 2s 1;
    animation-fill-mode: forwards;
}
#map .enemy {
    z-index: 9;
}
#map .boom {
    z-index: 7;
    animation: fade .8s 1;
    animation-fill-mode: forwards;
}
 @keyframes fade {
 from {
opacity: 1;
}
 to {
opacity: 0;
}
}
 @keyframes bling {
 0% {
opacity: 1;
}
 20% {
opacity: 0;
}
 40% {
opacity: 1;
}
 60% {
opacity: 0;
}
 80% {
opacity: 1;
}
 100% {
opacity: 0;
}
}
#score {
    display: none;
    position: absolute;
    top: 10px;
    left: 10px;
    color: #fff;
    line-height: 20px;
    font-size: 14px;
    font-weight: bold;
    z-index: 20;
}
#restart {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 30;
}
#restart p {
    width: 300px;
    height: 40px;
    line-height: 20px;
    margin: 140px auto;
    color: #fff;
    text-align: center;
}
#restart p span {
    font-weight : bolder;
    font-size: 22px;
    text-align: center;
}
#restart .p1 span {
    color: red;
    font-size: 30px;
}
#restart .p2 span {
    color: #ffa80c;
}
#restart .p3 {
    font-size: 20px;
    width: 100px;
    height: 35px;
    background: rgb(255,255,255);
    background: rgba(255,255,255,.8);
    color: #000;
    font-weight: bolder;
    line-height: 35px;
    text-align: center;
    border-radius: 3px;
    cursor: pointer;
}
#restart .p3:hover {
    background: white;
}