body {
    background-color: aqua;
    font-size: 1.2rem;
}

h2 {
    text-align: center;
}

p {
    display: block;
    margin-top: 6%;
    position: absolute;
    text-align: center;
    /* left: 48%; */
    width: 100%;
    /* transform: translate(-50%, -50%); */
}

input {
    border: none;
    border-bottom: 2px solid rgba(30, 214, 214, 0.856);
    background-color: rgba(0, 0, 0, 0);
    margin-top: 20%;
    color: wheat
}


#result {
    display: block;
    margin-top: 15%;
}


.tip {
    border: 2px solid #ff0095;
    display: block;
    margin-left: auto;
    margin-right: auto;
    margin-top: 1.4em;
    padding: 1em;
    border-radius: 15px;
    max-width: 390px;
    min-width: 385px;
}






.nice-border {
    width: 400px;
    height: 200px;
    margin: auto;
    margin-top: 70px;
    position: relative;
    background: #1c1f2b;
    color: white;
    text-align: center;
    border-radius: 5px;


    padding-left: 10px;
    padding-right: 10px;
}

.nice-border::after,
.nice-border::before {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background: conic-gradient(from var(--angle), #ff4545, #00ff99, #006aff, #ff0095, #ff4545);
    left: 50%;
    top: 50%;
    translate: -50% -50%;
    z-index: -1;
    padding: 4px;
    border-radius: 5px;
    animation: 3s spin linear infinite;
    opacity: 0.7;
    filter: blur(0.5em);
}

.nice-border::before {
    filter: blur(0.5em);
}




@property --angle {
    syntax: "<angle>";
    initial-value: 0deg;
    inherits: false;
}

@keyframes spin {
    from {
        --angle: 0deg;
    }

    to {
        --angle: 360deg;
    }
}