Posicionamiento y desplazamiento de cajas

[tonixiri]

Hola amigos soy nuevo en esto del lenguaje Css.

Yo quiero que se me estructuren todas ordenadas y que las otras no se muevan pero nose porque se me mueven.
Os paso el texto HTML y Css y haber si me podeis ayudar.
Gracias.

Css:

Código CSS:

@charset "UTF-8";
/* CSS Document */
a.Inicio { 
text-decoration:none;
color:#333;
border-style:double;
border-spacing:10px;
padding:7px 20px 7px 20px;
background-color:#CCC;
font-family:Georgia, "Times New Roman", Times, serif;
font-size:16px;
font-weight:500;
border-radius: 50px;
margin-left:20px;
margin-right:20px;
}
a.Productos {
text-decoration:none;
color:#333;
border-style:double;
border-spacing:10px;
padding:7px 20px 7px 20px;
background-color:#CCC;
font-family:Georgia, "Times New Roman", Times, serif;
font-size:16px;
font-weight:500;
border-radius: 50px;
margin-left:20px;
margin-right:20px;
}
a.Ofertas {
    text-decoration:none;
color:#333;
border-style:double;
border-spacing:10px;
padding:7px 20px 7px 20px;
background-color:#CCC;
font-family:Georgia, "Times New Roman", Times, serif;
font-size:16px;
font-weight:500;
border-radius: 50px;
margin-left:20px;
margin-right:20px;
}
a.Packs{
    text-decoration:none;
color:#333;
border-style:double;
border-spacing:10px;
padding:7px 20px 7px 20px;
background-color:#CCC;
font-family:Georgia, "Times New Roman", Times, serif;
font-size:16px;
font-weight:500;
border-radius: 50px;
margin-left:20px;
margin-right:20px;
}
a.Contactos{
    text-decoration:none;
color:#333;
border-style:double;
border-spacing:10px;
padding:7px 20px 7px 20px;
background-color:#CCC;
font-family:Georgia, "Times New Roman", Times, serif;
font-size:16px;
font-weight:500;
border-radius: 50px;
margin-left:20px;
margin-right:20px;
}
a.Inicio:hover{
text-decoration:none;
border-style:double;
padding:7px 20px 7px 20px;
font-family:Georgia, "Times New Roman", Times, serif;
font-style:italic;
color:#31C0E6;
background-color:#000;
}
a.Inicio:active{
    color:#ABEC00;
}
a.Productos:hover{
text-decoration:none;
border-style:double;
padding:7px 20px 7px 20px;
font-family:Georgia, "Times New Roman", Times, serif;
font-style:italic;
color:#31C0E6;
background-color:#000;
}
a.Productos:active{
    color:#ABEC00;
}
a.Ofertas:hover{
text-decoration:none;
border-style:double;
padding:7px 20px 7px 20px;
font-family:Georgia, "Times New Roman", Times, serif;
font-style:italic;
color:#31C0E6;
background-color:#000;
}
a.Ofertas:active{
    color:#ABEC00;
}
a.Packs:hover{
text-decoration:none;
border-style:double;
padding:7px 20px 7px 20px;
font-family:Georgia, "Times New Roman", Times, serif;
font-style:italic;
color:#31C0E6;
background-color:#000;
}
a.Packs:active{
    color:#ABEC00;
}
a.Contactos:hover{
text-decoration:none;
border-style:double;
padding:7px 20px 7px 20px;
font-family:Georgia, "Times New Roman", Times, serif;
font-style:italic;
color:#31C0E6;
background-color:#000;
}
a.Contactos:active{
    color:#ABEC00;
}
a{alignment-adjust:middle;
}
a{position:relative;
left:160px;
}
#contmiformu legend{font-style:italic; font-size:18px; font-family:Verdana, Geneva, sans-serif; color:#7F204C;}
#contmiformu{padding:none; border:none; width:800px; position:relative; top:100px; left:350px;}
#miformu{ width:300px; background-image:linear-gradient(bottom, rgb(102,255,255) 47%, rgb(51,153,255) 68%); background-image:-o-linear-gradient(bottom, rgb(102,102,255) 47%, rgb(51,51,255) 68%); background-color:#3CF; background-image: -webkit-gradient(
 linear,
 left bottom,
 left top,
 color-stop(0.47, rgb(192,204,20)),
 color-stop(0.68, rgb(91,240,126))
);
border-width: 2px;
border-color: #26600c;
border-style: solid;
-moz-border-radius: 15px 15px 15px 15px;
-webkit-border-radius: 15px 15px 15px 15px;
border-radius: 15px 15px 15px 15px;
}
 
#miformu label {
 display: block;
    margin:0;
}
 
#miformu label span {
   display: block;
   margin-left: 7px;
}
#miformu label input {
    margin-left: 40px;
    margin-top: 5px;
    padding-left: 3px;
    border-color: #ff6a00;
    -moz-transition: all .25s; 
    -webkit-transition: all .25s; 
    -o-transition: all .25s;
    transition: all .25s;
}
 
#miformu label textarea {
    margin-left: 40px;
    margin-top: 5px;
    padding-left: 6px;
    border-color: #ff6a00;
    -moz-transition: all .25s; 
    -webkit-transition: all .25s; 
    -o-transition: all .25s;
    transition: all .25s;
}
#miformu label input:focus, #miformu label textarea:focus {
    background: #fff; 
    border-color: #0000FF; 
    box-shadow: 0 0 4px #0000FF; 
    padding-right:65px;
    margin-left: 10px;
}
 
#miformu .submit {
    margin-left: 50px;
    font-size: 14px;
    font-weight: bold;
    padding: 6px;
    margin-bottom: 7px;
    background-color: #808080;
    color: #fff;
    cursor: pointer;
    -moz-transition: all .32s; 
    -webkit-transition: all .32s; 
    -o-transition: all .32s;
    transition: all .32s;
    }
 #miformu .submit:hover {
    padding: 3px 5px;
    background-color: #ebe7e7;
    color: #0000FF;
    }
    embed{position:relative;
    top:200px;
    right:200px;
    }
 

HTML

Código HTML:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Inicio</title>
<link href="Estilos.css" type="text/css" rel="stylesheet" />
</head>
 
 
<body>
<img src="Blue Mouse.png" width="1112" height="141"/>
<a href="Inicio.html" class="Inicio">Inicio</a>&nbsp;&nbsp;&nbsp;
<a href="Productos.html" class="Productos">Productos</a>&nbsp;&nbsp;&nbsp;
<a href="Ofertas.html" class="Ofertas">Ofertas</a>&nbsp;&nbsp;&nbsp;
<a href="Packs.html" class="Packs">Packs</a>&nbsp;&nbsp;&nbsp;
<a href="Contacto.html" class="Contactos">Contactos</a>
<embed src="Proyecto nuevo 1.m4v" autostart="true" loop="true"></embed>
</body>
</html>
 

Mi problema esta que cuando coloco el embed se me mueven los <a> hacia abajo y no quiero que pase eso y no me obedece cuando le pongo valores en top y right.......

Soy novao losiento......