sk.css

.d_button{

    align-items: center;
    justify-content: center;
    color: yellow;
    padding: 10px;
    font-size: 20px;
    background-color: transparent;
margin-top: 20%;
animation: glowing-border 2s infinite;

    }
    .hc{

        display: flex;
        justify-content: center;
    }
h1{
    margin-top: 20%;
    padding: 10px;
    color: yellow;
}
    @keyframes glowing-border {
        0% {
          border-color: rgba(255, 255, 255, 0.2);
          box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
        }
        50% {
          border-color: rgba(255, 255, 255, 0.7);
          box-shadow: 0 0 20px rgba(255, 255, 255, 0.7);
        }
        100% {
          border-color: rgba(255, 255, 255, 0.2);
          box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
        }
      }