body 	{
        display: grid;
        grid-template-columns: repeat (1, 1fr);
        background: black;
        grid-template-rows: 1fr, 1fr, 1fr, 1fr;
        min-height: 100vH;
        margin-left: -1px;
        margin-right: -1px;
        margin-top: -1px;
        }

header  {
        display: grid;
        grid-column: 1 / 2;
        grid-row: 1 / 2; 
        text-align: center;
        background-image: radial-gradient(darkslategrey, black 70%);
        font-size:1.5em;
        font-style: normal;
        }

logo	{
        display: flex;
        grid-column: 1 / 2;
        grid-row: 2 / 3;    
        padding-top: 0em;
        padding-bottom: 0em;    
        background-image: radial-gradient(darkslategrey, black 80%);
        flex-direction:column;
        align-items: center;
        }

nav    {
        display: flex;
        width: -1;
        grid-column: 1 / 2;
        grid-row: 3 / 4;
        background-image: radial-gradient(darkslategrey, black 80%);
        flex-direction:column;
        align-items: center;
        }

li      {
        list-style-type: none;
        padding-left: 2em;
        padding-right: 2em;
        padding-top: 0.2em;
        padding-bottom: 0.1em;
        margin-bottom: 0.3em;
        margin-right: 2em;
        border: 1px solid silver;
        border-radius: 1em;
        text-align: center;
        font-size: 1.5em;
        }



contentbox   
        {
        display: flex;
        grid-column: auto;
        border: 1px solid silver;
        border-radius: 2em;   
        padding-left: 1em;
        padding-right: 1em;
        padding-top: 2em;
        padding-bottom: 1em;
        margin: 1em;
        flex-direction: column;
        align-items: center;
        background-image: linear-gradient(darkslategrey, black 30%, black 70%, darkslategrey);
        }

.videobox  
        {
        display: flex;
        width: 320px;
        height: 230px;
        padding-left: 0px;
        background-color: black;
        justify-content: center; 
        border: 2px solid silver;
        border-radius: 2em;
        overflow: hidden;
        margin: 1em;
        }

.photobox  
        {
        display: flex;
        width: 320px;
        height: 230px;
        background-color: black;
        justify-content: center; 
        align-items: center;
        border: 1px solid silver;
        border-radius: 2em;
        overflow: hidden;
        }

.textbox
        {
        display: flex;
        padding: 1em;
        margin: 1em;
        text-align: left;
        background-color: black;
        flex-direction: column;
        justify-content: center; 
        align-items: center;
        }

footer  {
        display: grid;
        grid-column: 1 / 2;
        background-color: black;
        border: 1px solid;
        border-color: silver;
        border-radius: 1em;
        padding: 5px;
        padding-top: 1em;
        margin: 1em;
        margin-bottom: -10px;
        background-image: radial-gradient(darkslategrey, black 70%);
        text-align: center;
        }    

h1,h2  	{
        font-family: "Courier New", Courier, monospace;
        color: #bdbdbd;
        }

h1      {
        color: #bdbdbd;
        }

h2      {
        font-size: 1.9em;
}


p, ol, ul, li, a
        {
        font-family: "Courier New", Courier, monospace;
        color: #bdbdbd;
        text-decoration: none;
        }

p       {
        font-size: 1.3em;
        }


/* Mobile first! 1-Spaltenlayout  */


/* 2-Spaltenlayout, sobald der Platz es erlaubt  */
@media only screen and (min-width: 45em) 
    {
    
header  {
        grid-column: 1 / 3;
        }

logo	{
        grid-column: 1 / 3;
        flex-direction: row;
        justify-content: center;
        }

nav    {
        grid-column: 1 / 3;
        }
        
ul      {
        display: flex;
        flex-direction: row;
        }

contentbox   
        {
        grid-column: auto;
        }

footer  {
        grid-column: 1 / 3;
        }
    }


/* 3-Spaltenlayout, sobald der Platz es erlaubt  */
@media only screen and (min-width: 65em)   
    {
    
header  {
        grid-column: 1 / 4;
        }

logo	{
        grid-column: 1 / 4;        
        }
        
nav    {
        grid-column: 1 / 4;
        }
        
footer  {
        grid-column: 1 / 4;
        }

    }