---

body{
    margin:0;
    font-family: Arial;

    /* фон на всех страницах */
    background-image: url("fon.jpg");
    background-size: cover;
    background-repeat: no-repeat;
}

.main-table,
.page-table{
    width:100%;
    height:100vh;
    border-collapse: collapse;
}

.header{
    height:80px;
    background:#555;
    color:white;
    text-align:center;
    font-size:32px;
    font-weight:bold;
}

.menu{
    width:250px;
    vertical-align: top;
}

.menu-table{
    width:100%;
    border-collapse: collapse;
}

.menu-table td{
    border:1px solid black;
    text-align:center;
    height:60px;
    background: rgba(255,255,255,0.7);
}

.menu-table a{
    text-decoration:none;
    color:black;
    font-weight:bold;
}

.menu-table a:hover{
    color:blue;
}

.content{
    text-align:center;
    vertical-align: middle;
    background: rgba(255,255,255,0.5);
}

h1{
    font-size:40px;
}