style.css

body{
    background: url(imagenes/fondo.jpg) no-repeat center center fixed;
    background-size: cover;
}

.logo{
   display: block;
   width: 200px; 
   margin: 0 auto;
   filter: drop-shadow(0 2px 5px #fff);
}

body.light-mode{
    --colorPulse1 : rgba(0, 0, 0, 0.85);
    --colorPulse2 : rgba(0, 0, 0, 0);
    --colorCard: rgba(255, 255, 255, 0.2);
    --colorTextoCard: #000;
    --sombraTexto: 2px 2px 5px rgb(17, 215, 250);
    --colorPanel:  rgba(255, 255, 255, 0.4);
    --sombraPanel: rgba(0, 0, 0, 1);
    --hoverCard: rgba(255, 255, 255, 0.5);
}

body.dark-mode{
    background-image: url(imagenes/fondo-oscuro.jpg);
    --colorPulse1 : rgba(255, 255, 255, 0.85);
    --colorPulse2 : rgba(255, 255, 255, 0);
    --colorCard: rgba(255, 255, 255, 0.2);
    --colorTextoCard: #fff;
    --sombraTexto: 2px 2px 5px #000;
    --colorPanel:rgba(0, 0, 0, 0.4);
    --sombraPanel: rgba(255, 255, 255, 0.5);
    --hoverCard:  rgba(255, 255, 255, 0.1);
}

.card{
    margin: 8px auto;
    width: 300px;
    text-align: center;
    box-shadow: 0 0 20px #000;
    border-radius: 20px;
    padding: 20px 0;
    background-color: var(--colorCard);
}

.card img{
    width: 250px;
    margin: 8px auto;
    transition: 0.2s ease;
    filter: drop-shadow(0 2px 5px #fff);
}

.card:hover img{
    transform: rotate(20deg);
    transition: 0.2s ease;
}

.card label{
    display: block;
    height: 20px;
    font-weight: bold;
    color: var(--colorTextoCard);
    text-shadow: var(--sombraTexto);
    font-size: 20px;
}

.container-pokebola{
    position: fixed;
    bottom: 15px;
    left: 15px;
}

.container-pokebola .panel{
    position: absolute;
    background-color: var(--colorPanel);
    transition: .3s all;
    box-shadow: 1px 1px 5px var(--sombraPanel);
    width: 90px;
    height: 180px;
    border-radius: 15px;
    transform: translateY(-100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-evenly;
    display: none;
}

.container-pokebola .panel.active{
    display: flex;
}

.container-pokebola .panel .oscuro{
    width: 70px;
    height: 70px;
    border-radius: 50%;
    cursor: pointer;
    border: 1px solid #fff;
    background-color: black;
    transition: .3 all;
}

.container-pokebola .panel .claro{
    width: 70px;
    height: 70px;
    border-radius: 50%;
    cursor: pointer;
    border: 1px solid #fff;
    background-color: yellow;
    transition: .3 all;
}


.container-pokebola .pokebola{
    cursor: pointer;
    border-radius: 50%;
    width: 70px;
    filter: sepia(50%);
    transition: .4s ease;
    animation: pulse 1.5s infinite;
}

.container-pokebola .pokebola:hover{
    filter: sepia(0);
    transition: .4s ease;
}

@keyframes pulse{
    0%{
        box-shadow: 0 0 0 0 var(--colorPulse1);
    }
    50%{
        box-shadow: 0 0 0 25px var(--colorPulse2);
    }
    100%{
        box-shadow: 0 0 0 0 var(--colorPulse2);
    }
}

@media (min-width: 1000px){
    .container-card{
        display: flex;
    }
    .card{
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
}