body, h1, h2, h3, p, ul, li {
    margin: 0;
    padding: 0;
    list-style: none;
}

body {
    font-family: 'Poppins', Arial, sans-serif;
    background-color: #f4f4f4;
}

#main {
    margin-left: 300px;
}

.portfolio-item {
    background-color: #fff;
    padding: 20px;
    margin: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    position: relative;
    transition: transform 0.3s ease-in-out;
}

.portfolio-item:hover {
    transform: translateY(-10px);
}

.portfolio-item img {
    max-width: 100%;
    border-radius: 10px;
}

.portfolio-item h3 {
    font-size: 24px;
    font-weight: 600;
    margin: 15px 0;
    color: #333;
}

.portfolio-item p {
    font-size: 16px;
    color: #777;
    margin-bottom: 20px;
}

.portfolio-item ul {
    font-size: 16px;
    color: #777;
    margin-bottom: 20px;
}

.btn-details {
    display: inline-block;
    padding: 10px 20px;
    background-color: #3498db;
    color: #fff;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s ease-in-out;
}

.btn-details:hover {
    background-color: #2980b9;
}

.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: none;
    background: #007bff;
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    text-align: center;
    line-height: 40px;
    font-size: 24px;
    z-index: 999;
}

.back-to-top:hover {
    background: #0056b3;
}

.back-to-top i {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-15px);
    }
    60% {
        transform: translateY(-10px);
    }
}