html body {
    width: 100%;
    min-height: 100%;
    top: 0;
    left: 0;

    margin: 0;
    padding: 0;

    position: absolute;
    user-select: none;
    -webkit-user-select: none;

    font-size: 30px;
    font-family: fantasy;
    font-weight: 200;

    color: wheat;
}

background {
    display: block;
    position: absolute;
    top: 0;
    left: 0; 
    width: 100%; 
    min-height: 100%;

    box-sizing: border-box;
    text-align: center;


    background: -moz-radial-gradient(center, ellipse cover, rgba(0,0,125,1) 0%, rgba(0,0,0,1) 100%); /* ff3.6+ */
    background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%, rgba(0,0,125,1)), color-stop(100%, rgba(0,0,0,1))); /* safari4+,chrome */
    background:-webkit-radial-gradient(center, ellipse cover, rgba(0,0,125,1) 0%, rgba(0,0,0,1) 100%); /* safari5.1+,chrome10+ */
    background: -o-radial-gradient(center, ellipse cover, rgba(0,0,125,1) 0%, rgba(0,0,0,1) 100%); /* opera 11.10+ */
    background: -ms-radial-gradient(center, ellipse cover, rgba(0,0,125,1) 0%, rgba(0,0,0,1) 100%); /* ie10+ */
    background:radial-gradient(ellipse at center, rgba(0,0,125,1) 0%, rgba(0,0,0,1) 100%); /* w3c */
}

tictactoe {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;

    width: 300px;
    height: 300px;
}

column {
    display: inline-block;

    width: 100px;
    height: 300px;

    box-sizing: border-box;
    border-radius: 5px;

}

column:not(:first-child) {
    border-left: 1px solid white;
}

row {
    display: block;
    width: 100px;
    height: 100px;
    box-sizing: border-box;

    line-height: 120px;
    font-size: 60px;
    text-align: center;

    cursor: default;
    border-radius: 5px;
}

row:not(:first-child) {
    border-top: 1px solid white;
}

row.empty:hover {
    cursor: pointer;
    background: rgba(0,0,0,0.25);
}

row.winner {
    background-color: rgba(255,255,255,0.25);

    text-shadow:
       -1px -1px 0 black,  
        1px -1px 0 black,
        -1px 1px 0 black,
         1px 1px 0 black;
}

choice {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;

    width: 350px;
    height: 350px;

    background-color: rgba(0,0,0,0.75);
    border-radius: 30px;
}

choice-x, choice-o, choice-or {
    display: inline-block;
    cursor: default;

    font-size: 150px;
    line-height: 150px;
    margin: 125px 0;

    text-shadow:
       -1px -1px 0 black,  
        1px -1px 0 black,
        -1px 1px 0 black,
         1px 1px 0 black;
}

choice-x, choice-o {
    cursor: pointer;
}

choice-x:hover, choice-o:hover {
    color: white;
    transform: scale(1.1,1.1);
}