body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    
}
.osnowa_content {
    position: relative; /* або просто прибери position */
    margin-top: 110px;
     margin-bottom: 110px; 
    padding: 20px 0;
    width: 100%;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 900;
    border-radius: 10px;
}