style.css

body{
    background: #000;
}

.meglepetes,
.meglepetes:before,
.meglepetes:after{
    width: 200px;
    height: 200px;
    background: red;
}

.meglepetes{
    position: relative;
    margin: 200px auto;
    transform: rotate(45deg);
    animation: animate 1s linear infinite;
}


.meglepetes:before,
.meglepetes:after{
    position: absolute;
    content: '';
    border-radius: 50%;
}

.meglepetes:before{
    bottom: 0px;
    left: -100px;
}

.meglepetes:after{
    top: -100px;
    right: 0;
}

@keyframes animate{
    0%{
        transform: rotate(45deg), scale(1);
    }

    25%{
        transform: rotate(45deg) scale(1.2);
    }

    50%{
        transform: rotate(45deg) scale(1.4);
    }

    75%{
        transform: rotate(45deg) scale(1.2);
    }

    90%{
        transform: rotate(45deg) scale(1);
    }

    100%{
        transform: rotate(45deg) scale(1);
    }
}