@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;300;500;700&display=swap');

 .btn{
      position: relative;
      padding: 20px 50px;
      text-decoration: none;
      color: #fff;
      letter-spacing: 10px;

    }

  .boton-plan{
    border: 0.5px solid #91ff8f ;
    
    overflow: hidden;
  }

  .boton-plan::after{
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background-color: rgb(10, 157, 255);
    z-index: -2;
  }

  .boton-plan::before{
    content: "";
    position: absolute;
    width: 100%;
    height: 250px;
    left: 0;
    bottom: -150%;
    border-radius: 30%;
    background-color: #151e3f;
    z-index: -1;
  }

  .boton-plan:hover::before{
    animation: boton-plan 2s linear both;
  }
  @keyframes boton-plan{
    0%{
      transform: rotate(0deg);
    }
    100%{
      bottom: 100px;
      transform: rotate(360deg);
    }
  }