* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

.page-memory-game {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    object-fit: cover;
    text-align: center;
    background: transparent url(../img/background.jpg) no-repeat;
    animation: moving 60s infinite;
    background-position: right;
    animation-timing-function: linear;
}

@keyframes moving {
    50% {
        background-position: left;
    }
    100% {
        background-position: right;
    }
}

.page-title {
    width: 100%;
    color: #fff;
    font-weight: 900;
    text-shadow: #000 0 1px 1px;
    text-transform: uppercase;
}
.page-footer {
    width: 100%;
    height: 50px;
    display: flex;
    justify-content: center;
}

.credits {
    position: absolute;
    text-align: start;
    bottom: 0;
    left: 0;
    margin-left: 16px;
    color: lightslategray;
}

.credits a {
    color: lightslategray;
}