minesweeper.css

body {
    font: 14px "Helvetica Neue", Helvetica, Arial, sans-serif
}

a {
    color: #888888;
}

div, table { /* center by default */
    text-align: center;
    margin: auto;
}

h1#title {
    text-align: center;
    margin: .5em 0;
}

div#controls {
    margin: .5em 0;
}

button {
    padding: .5em 1.5em;
    font-weight: bold;
    
    -wekit-border-radius: 1em;
    -moz-border-radius: 1em;
    border-radius: 1em;
    border: 1px solid #ccc;
    
    background-color: #eee;
    background-repeat: repeat-x;
    background-image: -khtml-gradient(linear, left top, left bottom, from(#fff), to(#f1f1f1));
    background-image: -moz-linear-gradient(top, #fff, #f1f1f1);
    background-image: -ms-linear-gradient(top, #fff, #f1f1f1);
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #fff), color-stop(100%, #f1f1f1));
    background-image: -webkit-linear-gradient(top, #fff, #f1f1f1);
    background-image: -o-linear-gradient(top, #fff, #f1f1f1);
    background-image: linear-gradient(top, #fff, #f1f1f1);
    
    -moz-box-shadow: 0px 1px 4px rgba(0, 0, 0, .3);
    -webkit-box-shadow: 0px 1px 4px rgba(0, 0, 0, .3);
    box-shadow: 0px 1px 4px rgba(0, 0, 0, .3);
}

button:hover {
    background-position: 0 -15px;
}

button:active {
    background-position: 0 -50px;
}

table#grid {
    border-collapse: collapse;
}

table#grid tr td {
    width: 50px;
    height: 50px;
    text-align: center;
    padding: 0;
    outline: 1px ridge #555;
    border: 0 none;
    box-shadow: inset -3px -3px 3px #555;
    background-color: #DDDDDD;
    background-image: url("img/flag.png"), url("img/question_mark.png"), url("img/bomb.png");
    background-size: 100% 100%, 100% 100%, 100% 100%;
    background-position: -999px -999px, -999px -999px, -999px -999px;
    background-repeat: no-repeat;
    overflow: hidden;
}

table#grid tr td:hover {
    background-color: #EEEEEE;
}

table#grid tr td.mined {
    background-position: -999px -999px, -999px -999px, left top;
}

table#grid tr td.flagged {
    background-position: left top, -999px -999px, -999px -999px;
}

table#grid tr td.marked {
    background-position: -999px -999px, left top, -999px -999px;
}

table#grid tr td.mined.flagged {
    background-position: left top, -999px -999px, left top;
}

table#grid tr td.mined.marked {
    background-position: -999px -999px, left top, left top;
}
    
table#grid tr td.revealed {
    box-shadow: none;
    background-color: #CCCCCC;
}

#status {
    text-align: center;
}

#credits {
    margin-top: 20px;
    margin-bottom: 20px;
}