#principal{
    width: 1500px;
    height: 700px;
    margin: auto;
}

header{
    width: 1500px;
    height: 100px;
    border: 1px solid #B71C1C;
    border-top: 0px;
    border-left: 0px;
    border-right: 0px;
    
}

#logo{
    width: 300px;
    height: 100px;
    text-align: center; 
    float: left;
}

#foto{
    width: 300px;
    height: 100px;
    text-align: left; 
    float: left;
    margin-left: 650px;
    margin-top: -10px;
}

#user{
    float: left;
    margin-left: -180px;
    font-size: smaller;
    font-family: Arial;
}

.menu{
    width: 200px;
    height: 597px;
    margin-top: 0px;
    margin-left: 0px;
    text-align: center;
    border: 1px solid #B71C1C;
    border-top: 0px;
    border-left: 0px;
    border-bottom: 0px;
}

.menu ul{
    margin-top: 0px;  
}

.menu ul li{
    list-style: none;
    width: 200px;
    height: 30px;
    margin-left: -41px;   
    border: 1px solid #B71C1C;
    border-right: 0px;
    background: #4169E1;
    border-top-width: 0px;
    font-size: 80%;
    font-family: Arial;
}

.menu ul li a{
    text-decoration: none;
    padding: 5px 5px;
    color: #ffffff; 
}

.contenido{
    font-family: Arial;
}

.contenido div h1{
    width: 1400px;
    height: 0px;
    margin-top: -215px;
    margin-left: 100px;
    text-align: center;
    border-top: 0px;
    border-left: 0px;
    border-bottom: 0px;
    size: 20px;
    font-size: 200%;
}

.contenido .busqueda{
    margin-left: 300px;
    margin-top: 50px;
    size: 20px;
    display: flex;
}

.contenido .busqueda input{
    margin-left: 10px;
    size: 20px;
}

.contenido .busqueda select{
    margin-left: 20px;
}

.contenido .button{
    margin-left: 320px;
    margin-top: 10px;
}

.contenido .producto{
    margin-left: 320px;
    margin-top: 10px;
}