* {
    box-sizing: border-box;
}
html, body {
    overscroll-behavior-y: contain; /* prevent pull down to refresh on mobile */
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    background: #000;
    flex-direction: column;
}
.title {
    font-family: Arial, Helvetica, sans-serif;
    width: 230px;
    color: #fff;
    font-size: 24px;
    margin-bottom: 10px;
    text-align: center;
}
#wrapper {
    background: #c4d38b;
    padding: 10px;
    border-radius: 2px;
    margin-bottom: 10px;
}
#container {
    width: 210px;
    height: 120px;
    border: 3px solid #000;
    box-sizing: content-box;
    position: relative;
}
.pixel {
    position: absolute;
    width: 10px;
    height: 10px;
}
.game-over {
    font-size: 28px;
    padding-left: 6px;
    display: block;
    color: #000;
}

#keyboard{
    text-align: center;
 }
 .small {
    font-size: 12px;
    vertical-align: middle;
    padding: 0 5px;
 }
 button{
    display: inline-block;
    text-align: center;
    font-size: 20px;
    margin: 5px;
    transition: 0.12s ease-out;
    padding: 0 5px;
    width: 65px;
    height: 40px;
    background-color:rgba(255,255,255,0);
    color: #fff;
    border: 2px solid #fff;
    border-radius: 50%;
 }
 button:not([disabled]):active{
    background-color: rgba(255,255,255,0.25);
 }