body{
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgb(160, 157, 157);
}

.loader{
    height: 200px;
    width: 200px;
    border: 12px solid;
    border-radius: 50%;
    border-right-color: #4070f4;
    animation: spin 1s ease infinite;
    color: #fff;
}

@keyframes spin {
    100%{
        transform: rotate(360deg);
    }
}

/* Botão voltar */
.back-btn {
position: fixed;
top: 20px;
left: 20px;
background: #38bdf8;
color: #0f172a;
padding: 10px 16px;
border-radius: 8px;
text-decoration: none;
font-weight: 600;
transition: all 0.3s ease;
box-shadow: 0 5px 15px rgba(56, 189, 248, 0.3);
}

/* Hover */
.back-btn:hover {
background: #0ea5e9;
transform: translateY(-2px);
box-shadow: 0 8px 20px rgba(56, 189, 248, 0.5);
}