Opendistrib/backend/web/sass/_adminlte.scss

.main-header {
    .messages-menu, .notifications-menu, .tasks-menu, .link-control-sidebar {
        display: none ;
    }
}

body.login-page {
    background: none ;
    background-color: $color2 ;
    .login-box {
        .login-logo {
            text-align: center ;
            font-family: 'comfortaalight' ;
            img {
                width: 50px ;
            }
        }
        .login-box-body {
            .btn-primary {
                background-color: $color1 ;
                border-color: $color1 ;
                padding: 5px 10px ;

                &:active {
                    background-color: lighten($color1, 5) ;
                    border-color: $color1 ;
                }
            }

            a {
                color: $color1 ;
                &:hover {
                    color: lighten($color1, 5) ;
                }
            }
        }
    }
}