/* overall setting */
body {
    background-color: #2d2d2d;
    color: white;
    font-size: 20px;
}

h1 { /*BIG title (e.g., "Mancala", "Reversi")*/
    font-size: 50px;
    text-align: center;
}

h2 {
    margin-bottom: 0%;
    padding-bottom: 0%;
    font-size: 30px;
    text-align: center;
    vertical-align: top;
    height: 15%;
}

#who_wins {
    margin-top: 10%;
    font-size: 30px;
    text-align: center;
}

#results {
    margin-top: 10%;
}

p {
    text-align: center;
}

#top {
    margin-top: 5%;
    height: 15%;
}

#stage {
    height: 50%;
}

#bottom {
    height: 15%;
}

/* welcome page */
#welcome_buttons_en {
    margin-top: 10%;
}

#welcome_buttons_cn {
    margin-top: 10%;
}

/* options page */
#options_ai {
    margin-top: 10%;
}

#ai_on {
    transition-duration: 0s;
}

#ai_on:hover {
    background-color: #2d2d2d;
    color: white;
}

#ai_off_en {
    /* background-color: white;
    color: #2d2d2d; */
    transition-duration: 0s;
}

#ai_off_cn {
    /* background-color: white;
    color: #2d2d2d; */
    transition-duration: 0s;
}

#options_lan {
    margin-top: 5%;
}

#en {
    transition-duration: 0s;
}

#cn {
    transition-duration: 0s;
}

#cn:hover {
    background-color: #2d2d2d;
    color: white;
}

/* rules page */
li {
    text-align: left;
    font-size: 16px;
}

#ref_en p {
    text-align: left;
    font-size: 16px;
}

#ref_cn p {
    text-align: left;
    font-size: 16px;
}

/* game page */
#game_ground {
    height: 480px;
}
#game_ground .column {
    width: 60px;
    margin: 0px;
}

/* background cells */
.ele {
    position: static;
    background-color: rgba(0, 0, 0, 0);
    color: #ffffff;
    /* border: solid 2px #ffffff; */
    /* border-radius: 50%; */
    border: 0px;
    cursor: pointer;
    transition-duration: 0s;
    vertical-align: middle;
    text-align: center;
    width: 60px;
    height: 60px;
}

#game_ground {
    position: relative;
}

/* horizontal lines*/
.hori-line {   
    position: absolute;  
    width: 74.7%;
    height: 1px;
    margin-left: 28px;
    border-top: solid 2px #ffffff;
    text-align: center;
}

/*vertical lines*/
.vert-line { 
    position: absolute;   
    width: 1px;
    height: 90.5%;
    margin-top: 30px;
    border-right: solid 2px #ffffff;
    text-align: center;
}


/* round pieces */
.circle1 {
    background-color: #ffffff;
    border-radius: 50%;
    margin: auto;
    width: 35px;
    height: 35px;
}

.circle2 {
    background-color: #2d2d2d;
    border-radius: 50%;
    border: solid 2px #ffffff;
    margin: auto;
    width: 35px;
    height: 35px;
}