.sky{
	position: relative;
	overflow: hidden;
	z-index:1;
	color: #fff;
    text-shadow: 1px 1px 4px #0000008c;
}

.sky h1 {
 font-weight: 900;
}

.sky-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    transition: all 1s ease;
	pointer-events: none;
}

.sky .btn.btn-link
{
	color: #fff !important;
}

/* Day sky - sky-500 to sky-100 */
.sky-background.day {
    background: linear-gradient(to bottom, #0ea5e9 0%, rgba(125, 211, 252, 0.7) 50%, #e0f2fe 100%);
}

/* Night sky - slate-900 via indigo-900/30 to slate-900 */
.sky-background.night {
    background: linear-gradient(to bottom, #0f172a 0%, rgba(49, 46, 129, 0.3) 30%, #0f172a 100%);
}

/* Stars */
.star {
    position: absolute;
    border-radius: 50%;
    background: white;
    opacity: 0;
    animation: twinkle 3s infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0; }
    50% { opacity: 1; }
}

/* Clouds */
.cloud {
    position: absolute;
    transition: opacity 0.5s ease;
}

.cloud img {
    width: 100%;
    height: auto;
    filter: brightness(1.2) contrast(0.8);
}

.cloud.night img {
    filter: brightness(0.3) contrast(0.5);
}

.cloud-big {
    width: 60vw;
    animation: float-slow 60s infinite linear;
}

.cloud-small {
    width: 20vw;
    animation: float 40s infinite linear;
}

@keyframes float-slow {
    0% { transform: translateX(-100vw); }
    100% { transform: translateX(100vw); }
}

@keyframes float {
    0% { transform: translateX(-50vw); }
    100% { transform: translateX(120vw); }
}

.error-404-page{
	display:flex;
	align-items: center;
	justify-content: center;
}