.container-404 {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.content-txt {
    width: 100%;
    background-color: #d8d8d8;
}

.content-txt h1 {
    font-size: 3em;
    margin-bottom: 20px;
    color: #003366;
}

.content-txt p {
    font-size: 1em;
    font-weight: 800;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.5;
    padding: 0 0 2em;
}