/*五子棋css*/
* {
    margin: 0px;
    padding: 0px;
}

#chess {
    position: relative;
    width: 762px;
    height: 762px;
    margin: 50px auto 0px auto;
    background-image: url(../img/timg.jpg);
    background-size: 100% 100%;
}

.grid {
    width: 50px;
    height: 50px;
    position: absolute;
    padding: 5px;
    box-sizing: border-box;
    border-radius: 25px;
    background-origin: content-box;
    background-size: 100% 100%;
    background-repeat: no-repeat;
    line-height: 50px;
    text-align: center;
    color: aqua;
}


button {
    cursor: pointer;
    width: 150px;
    height: 44px;
    margin-top: 25px;
    padding: 0;
    background: #ef4300;
    -moz-border-radius: 6px;
    -webkit-border-radius: 6px;
    border-radius: 6px;
    border: 1px solid #ff730e;
    -moz-box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .25) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    -webkit-box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .25) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .25) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    font-family: 'PT Sans', Helvetica, Arial, sans-serif;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, .1);
    -o-transition: all .2s;
    -moz-transition: all .2s;
    -webkit-transition: all .2s;
    -ms-transition: all .2s;
}

button:hover {
    -moz-box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .15) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    -webkit-box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .15) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .15) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
}

button:active {
    -moz-box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .15) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    -webkit-box-shadow: 0 15px 30px 0 rgba(255, 255, 255, .15) inset,
    0 2px 7px 0 rgba(0, 0, 0, .2);
    box-shadow: 0 5px 8px 0 rgba(0, 0, 0, .1) inset,
    0 1px 4px 0 rgba(0, 0, 0, .1);

    border: 0px solid #ef4300;
}