gobang.css

@charset "utf-8";

#container{
    width: 750px;
}
.cell{
    width: 50px;
    height: 50px;
    display: inline-block;
    vertical-align: bottom;
    position: relative;
}
.topleft{
    width: calc(50% - 1px);
    height: calc(50% - 1px);
    display: inline-block;
    border-bottom: solid 1px black;
    border-right: solid 1px black;
    background-color: brown;
    z-index: 100;
}
.topright{
    width: calc(50% - 1px);
    height: calc(50% - 1px);
    display: inline-block;
    border-bottom: solid 1px black;
    border-left: solid 1px black;
    background-color: brown;
    z-index: 100;
}
.bottomleft{
    width: calc(50% - 1px);
    height: calc(50% - 1px);
    display: inline-block;
    border-top: solid 1px black;
    border-right: solid 1px black;
    background-color: brown;
    position: absolute;
    left: 0%;
    top: 50%;
    z-index: 100;
}
.bottomright{
    width: calc(50% - 1px);
    height: calc(50% - 1px);
    display: inline-block;
    border-top: solid 1px black;
    border-left: solid 1px black;
    background-color: brown;
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 100;
}
.cell.white::before{
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    content: " ";
    display: block;
    margin-top: 5px;
    margin-left: 5px;
    position: absolute;
    border-radius: 50px;
    background-color: white;
    z-index: 200;
}
.cell.black::before{
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    content: " ";
    display: block;
    margin-top: 5px;
    margin-left: 5px;
    position: absolute;
    border-radius: 50px;
    background-color: black;
    z-index: 200;
}