:root {
    --primary-color: #511972;
    --btn-primary-color: #B034D4;
    --btn-secondary-color: #451A6E;
    --text-white: #fff;
}
body {
    background: var(--primary-color) url('https://content.hollywoodbets.net/bg_sliver_51f0170ea3.gif') repeat-x top left;
}

.btn-custom {
    background: linear-gradient(to bottom, var(--btn-primary-color), var(--btn-secondary-color));
    border-color: var(--btn-secondary-color);
    transition: all 0.4s ease;
}
    .btn-custom:hover, .btn-custom:focus {
        background: linear-gradient(to top, var(--btn-primary-color), var(--btn-secondary-color));
        border-color: var(--btn-primary-color);
        transition: all 0.4s ease;
    }

.box-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    color: var(--text-white);
}

.page-404 h1 {
    font-size: 4rem;
}

.lds-ripple {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
}

    .lds-ripple div {
        position: absolute;
        border: 4px solid #fff;
        opacity: 1;
        border-radius: 50%;
        animation: lds-ripple 1s cubic-bezier(0, 0.2, 0.8, 1) infinite;
    }

        .lds-ripple div:nth-child(2) {
            animation-delay: -0.5s;
        }

@keyframes lds-ripple {
    0% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 0;
    }

    4.9% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 0;
    }

    5% {
        top: 36px;
        left: 36px;
        width: 0;
        height: 0;
        opacity: 1;
    }

    100% {
        top: 0px;
        left: 0px;
        width: 72px;
        height: 72px;
        opacity: 0;
    }
}