.b111{
    animation: updown 5s infinite;
}
.b222{
    animation: updown 5s infinite;
}
.b333{
    animation: updown 5s infinite;
}
.b444{
    animation: updown 5s infinite;
}
.medi-robot{
}
@keyframes updown {
    0%   {top: -90px;  }/*
    /* 25%  {top: 0px; left: 500px; } left: 500px;*/
    50%  {top: -130px;  }
    /* 75%  {top: 500px; left: 0px; }left: 0px;
left: 0px; */
    100% {top: -90px;  }
} */
/* @keyframes updown {
    0%   {margin-top: 0px;  }
    /* 25%  {top: 0px; left: 500px; } left: 500px;*/
    50%  {margin-top: -50px;  }
    /* 75%  {top: 500px; left: 0px; }left: 0px;
left: 0px; */
    100% {margin-top: 0px;  }
} */