header {

background-color : #900C3F ;
} 
header nav ul li a {color: white;}
main{
    padding-top: 0px;
    margin-bottom: 0;
    height: 0vh;
    
}
main iframe{
    border: 0;
    width: 100%;
    height: 100vh;
}
#showHeader{
    position: fixed;
    right: 0;
    top: 0;
    background-color: #fff;
    display: inline-block;
   
    text-decoration: none;
    font-size: 0;
    width: 35px;
    height: 35px;
    
    background-image: url(/img/expand.png);
    background-size: 85% auto;
    background-position: center center;
    background-repeat: no-repeat;
        transition: .3s;
    
}
#showHeader:hover{
    background-color: rgb(183,8,25);
}