button{
    background: black;
    cursor: pointer;
    border: none;
    padding: 16px 32px;
    font-size: 24px;
    color: white;
    font-weight: bold;
    position: relative;
    border-radius: 12px;
}

button::before{
    content: "";
    position:absolute;
    top:0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg,
    red,blue, deeppink,blue,red, blue,deeppink
    ,blue);
    background-size: 800%;
    border-radius: 10px;
    filter: blur(8px);
    animation: glowing 20s linear infinite
    }
    @keyframes glowing {
        0%{
        background-position: 0 0;
        }
        50%{
            background-position: 400% 0;
            }
        100%{
            background-position: 0 0;
            }
        
    }
    body{
        background: black;
    }