* {
    box-sizing: border-box;
}
html, body {
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
}
body {
    background: linear-gradient(yellow, steelblue);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.restart {
    display: block;
    margin: 0.25rem auto;
}
h3 {
    text-align: center;
}
.inert {
    pointer-events: none;
}
.grid {
    border: 1px solid #444;
    background: wheat;
    display: grid;
    grid-gap: 1px;
    grid-template-columns: repeat(7, 1fr);
    height: 248px;
    width: 295px;
    overflow: hidden;
    margin: 0 auto;
}
.grid div {
    height: 40px;
    width: 40px;
    outline: 1px solid #bbb;
    position: relative;
}
[class*=player]{
    border-radius: 100%;
    transition: transform 200ms;
}
.taken {
    opacity: 0;
}
.player-one {
    background-color: crimson;
}
.player-two {
    background-color: blue;
}