/* General */
html,
body {
    height: 100%;
}
body {
    background-image: url(/assets/img/recipiente.png);
    background-size: auto 500px;
    background-repeat: no-repeat;
    background-position: center;
    overflow: hidden;
}
.cosa {
    position: fixed;
    left: 50%;
    top: 50%;
    width: 30px;
    height: 10px;
    margin-left: -35px;
    margin-top: -10px;
    filter: blur(0.75em);
    opacity: 0.5;
}
.cosa_a {
    animation: levita 3s infinite ease-in-out reverse;
    border: 30px solid #00fff7;
    background-color: #00fff7;
}
.cosa_b {
    animation: levita 4s infinite ease-in-out;
    border: 20px solid #00ddff;
    background-color: #00ddff;
}
.cosa_c {
    animation: levita 2s infinite ease-in-out;
    border: 10px solid #FFFFFF;
    background-color: #FFFFFF;
    width: 50px;
    opacity: 0.75;
}
.cosa_d {
    animation: levita 4s infinite ease-in-out reverse;
    border: 20px solid #00fff7;
    background-color: #00fff7;
}
.cosa_e {
    animation: levita 5s infinite ease-in-out;
    border: 10px solid #00ddff;
    background-color: #00ddff;
}
.cosa_f {
    animation: levita 6s infinite ease-in-out;
    border: 5px solid #FFFFFF;
    background-color: #FFFFFF;
    width: 30px;
    opacity: 0.75;
}

@keyframes levita {
    0% {
        transform: rotate(0deg);
        border-radius: 35%;
        margin-top: -20px;
    }
    50% {
        margin-top: 10px;
    }
    100% {
        transform: rotate(360deg);
        border-radius: 15%;
        margin-top: -20px;
    }
}