@media (max-width: 550px){
    .header_left{
        display:none;
    }
    .navbar-brand > img {
    display: block;
    width: 300px;
    height: 80px;
    margin-left: 0px;
}
    .navbar {
        position: relative;
        min-height: 80px;
    }
    .navbar-nav {
    float: none;
    margin: 0;
    margin-left: 0em;
    background: #fff;
    margin-top: 1em;
    padding: 1em 1em;
}
    .navbar-default .navbar-toggle {
    border-color: #202020;
    margin: 25px 15px;
}
    .content.white {
    padding: 0em 0em;
}
    .navbar-default .navbar-collapse{
        margin-top: 0px;
    }
      .navbar-default .navbar-nav>li>a{
        width: 100%;
    }
}