*{
    font-family:'Poppins',sans-serif;
}

body{

    min-height:100vh;

    display:flex;

    justify-content:center;

    align-items:center;

    overflow:hidden;

    background:linear-gradient(135deg,#0ea5ff,#4facfe,#79c9ff);

    position:relative;

}

/* Background Bubble */

.circle{
    position:absolute;
    border-radius:50%;
    background:rgba(255,255,255,.12);
    animation:float 12s infinite ease-in-out;
}

.circle:nth-child(1){
    width:220px;
    height:220px;
    left:-80px;
    top:-60px;
}

.circle:nth-child(2){
    width:300px;
    height:300px;
    right:-120px;
    bottom:-120px;
    animation-duration:15s;
}

.circle:nth-child(3){
    width:120px;
    height:120px;
    right:25%;
    top:8%;
    animation-duration:9s;
}

@keyframes float{

0%{
transform:translateY(0px);
}

50%{
transform:translateY(-30px);
}

100%{
transform:translateY(0px);
}

}

.error-card{

    width:100%;
    max-width:650px;

    background:rgba(255,255,255,.95);

    border-radius:25px;

    padding:50px;

    text-align:center;

    backdrop-filter:blur(10px);

    box-shadow:0 25px 60px rgba(0,0,0,.15);

    animation:fadeUp 1s;

}

@keyframes fadeUp{

from{

opacity:0;
transform:translateY(40px);

}

to{

opacity:1;
transform:translateY(0);

}

}

.error-code{

    font-size:130px;

    font-weight:700;

    color:#2196f3;

    line-height:1;

    animation:pulse 2s infinite;

}

@keyframes pulse{

0%{
transform:scale(1);
}

50%{
transform:scale(1.05);
}

100%{
transform:scale(1);
}

}

.error-icon{

    font-size:70px;

    margin-bottom:20px;

    animation:floatIcon 3s infinite;

}

@keyframes floatIcon{

0%{
transform:translateY(0);
}

50%{
transform:translateY(-12px);
}

100%{
transform:translateY(0);
}

}

h2{

font-weight:600;

color:#0d6efd;

}

p{

color:#6c757d;

font-size:17px;

margin-top:15px;

}

.btn-home{

background:#0d6efd;

border:none;

padding:14px 35px;

border-radius:50px;

font-weight:600;

transition:.3s;

}

.btn-home:hover{

background:#0b5ed7;

transform:translateY(-3px);

box-shadow:0 12px 25px rgba(13,110,253,.35);

}

.btn-home:active{

transform:scale(.98);

}

.footer{

margin-top:35px;

font-size:14px;

color:#999;

}

@media(max-width:768px){

.error-card{

padding:35px 25px;

margin:20px;

}

.error-code{

font-size:90px;

}

.error-icon{

font-size:55px;

}

h2{

font-size:28px;

}

}