.card {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 30px;
    border-radius: 10px;
    height: 300px;
    width: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: #fff;
    box-shadow: 0px 15px 25px rgb(0, 0, 0, 0.25);
}

.themeChanger {
    position: absolute;
    top: 3%;
    right: 3%;
    cursor: pointer;
    font-size: 70px;
}

body.dark {
    background: #191919;
}

body.dark .themeChanger {
    color: #fff;
}

body.dark .card {
    background: #383838;
    color: #fff;
}