body{
    border-collapse: collapse;
    margin-top: auto;
    margin-right: auto;
    margin-left: auto;
    margin-bottom: auto;
    position: relative;
}

.band-top-page
{        
    height: 100px;
    box-sizing: border-box;
    background-color: rgba(70, 70, 70, 0.911);
    box-shadow: 0px 0px 10px black;
}

.band-error-page
{
    display: none;
    flex-direction: column;
    margin-top: 150px;
    text-align: center;
    box-sizing: border-box;
    box-shadow: 0px 0px 10px black;
    background-color: rgba(255, 157, 0, 0.911);
}

.band-error-page h1
{
    font-size: 36px;    
    color: white;
}

.band-error-page p
{  
   color: white;
}

.page404-btn-return
{
    display: none;
    margin-top: 100px;
    text-align: center;
}

.page404-btn-return a
{    
    padding-left: 100px;
    padding-right: 100px;
    padding-top: 20px;
    padding-bottom: 20px;
    text-decoration-line: none;

    background-color: rgb(37, 37, 37);
    font-size: 18px;
    color: rgba(255, 157, 0, 0.911);
    border: 2px solid rgba(255, 157, 0, 0.911);
    transition: 0.2s;
}

.page404-btn-return a:hover
{    
    background-color: rgba(255, 157, 0, 0.911);
    font-size: 18px;
    color: white;
    border: 2px solid white;
    box-shadow: 0px 1px 5px black;
}