header {
    background-image: url("fejlec-kep.jpg");
    background-size: cover;
    background-position: center;
    color: #fff;
    padding: 80px 20px;
    text-align: center;
    position: relative;
}

header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
}

header h1,
header p {
    position: relative;
    z-index: 1;
}
.hover-doboz {
    display: inline-block;
    position: relative;
    padding: 15px 20px;
    background: #eee;
    cursor: pointer;
}
.hover-szoveg {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 8px;
    background: #333;
    color: #fff;
    padding: 8px 12px;
    font-size: 14px;
    white-space: nowrap;
}

.hover-doboz:hover .hover-szoveg {
    display: block;
}