.ButtonSelector {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.ButtonSelector button {
    margin: 5px;
    padding: 5px;
    width: 80%;
    font-size: 200%;
    border: 1px solid grey;
    border-radius: 5px;
    background-color: lightgray;
    transition: all .12s ease;
    box-sizing: border-box;
}

.ButtonSelector button:focus, .ButtonSelector button:active {
  box-shadow: 0 0 1px 1px grey;
  outline: none;
}

.ButtonSelector button:active {
    background-color: #a8a8a8;
}