* {
    margin: 3px;
}

body {
    background-color: gray;
    font-family: "Trebuchet MS", sans-serif;
}

#outer {
    text-align: center;
}

#thirds {
    display: flex;
    text-align: center;
}

#left {
    width: 30%;
    margin: 0 auto;
}

#right {
    width: 30%;
    margin: 0 auto;
}

#statistics {
    background-color: white;
    border: 5px solid black;
    text-align: left;
    padding: 3px;
}

#main {
    text-align: center;
    display: inline-block;
    margin: 0 auto;
}

#board-container {
    margin: 0 auto;
    text-align: center;
    width: 400px;
    height: 400px;
    /*overflow: hidden;*/
    position: relative;
}

#game-board {
    background-color: black;
    display: grid;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: repeat(4, 100px);
    width: 400px;
    height: 400px;
    border: black solid 5px;
    padding: 0;
    margin: 0 auto;
    transform-origin: top left;
}

.square {
    background-color: white;
    box-sizing: border-box;
    width: 98px;
    height: 98px;
    border: 4px solid #424242;
    outline: 2px solid black;
    padding: 1px;
    margin: 0;

    font-weight: bolder;
    font-family: Segoe UI Black, sans-serif;
    font-size: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
}

label {
    font-weight: bolder;
    font-size: 16px;
}

#control {
    background-color: white;
    border: solid black 5px;
    margin: 0 auto;
    width: 60%;
}

button, select  {
    background-color: white;
    font-weight: bolder;
    font-size: 16px;
    border: solid black 3px;
}

button:hover {
    cursor: pointer;
}

button:active {
    filter: brightness(85%);
}

.vertical-spacer {
    height: 150px;
}

.unseen {
    visibility: hidden;
}