html - ul is applying styles but from where? -


i'm having trouble find reason why class named nav in ul element applying styles.

i'm using nav element directly style (without using classes). gave ul element class named nav , applying styles (but where?).

i had give ul margin: 0 , still have left padding, these styles coming from?

i'm not experienced css , i'd appreciate help.

this reproduced 

body {    background-color: #fff;    margin: 0;    font-family: 'open sans', sans-serif;    font-size: 14px;    line-height: 1.42857143;    color: #333;  }  /* header */    header {    min-height: 750px;    background: url(https://static.inmopaco.tk/images/banner2.jpg) no-repeat 0px 0px;    background-size: cover;    position: relative;  }  /* top bar menu */    .top-menu {    background: rgba(78, 197, 241, 0.81);    padding: 0.5em 0;  }  /* nav links */    nav {    background: none;    border: none;    margin: 2.2em 0 0;    float: left;    padding-left: 5%;    min-height: 50px;  }  nav:nth-child(3) {    float: right;    padding: 0 5% 0 0;  }  nav ul {    list-style: none;    margin: 0;  }  nav ul li {    margin: 0 1em;  }  nav ul > li {    float: left;  }  nav ul li {    color: #fff;    font-size: 1.2em;    padding: 0;    font-weight: 600;    -webkit-transition: color 0.3s;    -moz-transition: color 0.3s;    -o-transition: color 0.3s;    transition: color 0.3s;  }  nav ul li a:hover,  nav ul li a.active {    color: #000;    background: none;  }  nav ul li a::before {    position: absolute;    top: 65%;    left: 50%;    color: transparent;    content: '.';    text-shadow: 0 0 transparent;    font-size: 1.7em;    -webkit-transition: text-shadow 0.3s, color 0.3s;    -moz-transition: text-shadow 0.3s, color 0.3s;    -o-transition: text-shadow 0.3s, color 0.3s;    transition: text-shadow 0.3s, color 0.3s;    -webkit-transform: translatex(-50%);    -moz-transform: translatex(-50%);    -ms-transform: translatex(-50%);    -o-transform: translatex(-50%);    transform: translatex(-50%);    pointer-events: none;  }  nav ul li a:hover::before,  nav ul li a:focus::before,  nav ul li a.active::before {    color: #fff;    text-shadow: 10px 0 #000, -10px 0 #000;  }  /* logo */    .logo {    position: absolute;    left: 50%;    margin: 7px -90px 0;  }  .logo img {    width: 75%;  }  .clearfix:before,  .clearfix:after,  .dl-horizontal dd:before,  .dl-horizontal dd:after,  .container:before,  .container:after,  .container-fluid:before,  .container-fluid:after,  .row:before,  .row:after,  .form-horizontal .form-group:before,  .form-horizontal .form-group:after,  .btn-toolbar:before,  .btn-toolbar:after,  .btn-group-vertical > .btn-group:before,  .btn-group-vertical > .btn-group:after,  nav:before,  nav:after,  .nav:before,  .nav:after,  .navbar:before,  .navbar:after,  .navbar-header:before,  .navbar-header:after,  .navbar-collapse:before,  .navbar-collapse:after,  .pager:before,  .pager:after,  .panel-body:before,  .panel-body:after,  .modal-footer:before,  .modal-footer:after {    display: table;    content: " ";  }  .clearfix:after,  .dl-horizontal dd:after,  .container:after,  .container-fluid:after,  .row:after,  .form-horizontal .form-group:after,  .btn-toolbar:after,  .btn-group-vertical > .btn-group:after,  nav:after,  .nav:after,  .navbar:after,  .navbar-header:after,  .navbar-collapse:after,  .pager:after,  .panel-body:after,  .modal-footer:after {    clear: both;  }
<body>    <header>      <div class="top-menu">        <nav>          <ul class="nav">            <li><a class="home active">inicio</a>            </li>            <li><a class="services scroll">servicios</a>            </li>            <li><a class="aboutus">sobre nosotros</a>            </li>          </ul>        </nav>        <a class="logo">          <img src="//static.inmopaco.tk/images/logo.png">        </a>        <nav>          <ul class="nav">            <li><a class="home">inscripción</a>            </li>            <li><a class="services">acceso</a>            </li>          </ul>        </nav>        <div class="clearfix"></div>      </div>    </header>  </body>

ul default has margin , padding, , reset margin, have reset padding well

body {    background-color: #fff;    margin: 0;    font-family: 'open sans', sans-serif;    font-size: 14px;    line-height: 1.42857143;    color: #333;  }  /* header */    header {    min-height: 750px;    background: url(https://static.inmopaco.tk/images/banner2.jpg) no-repeat 0px 0px;    background-size: cover;    position: relative;  }  /* top bar menu */    .top-menu {    background: rgba(78, 197, 241, 0.81);    padding: 0.5em 0;  }  /* nav links */    nav {    background: none;    border: none;    margin: 2.2em 0 0;    float: left;    padding-left: 5%;    min-height: 50px;  }  nav:nth-child(3) {    float: right;    padding: 0 5% 0 0;  }  nav ul {    list-style: none;    margin: 0;    padding: 0  }  nav ul li {    margin: 0 1em;  }  nav ul > li {    float: left;  }  nav ul li {    color: #fff;    font-size: 1.2em;    padding: 0;    font-weight: 600;    -webkit-transition: color 0.3s;    -moz-transition: color 0.3s;    -o-transition: color 0.3s;    transition: color 0.3s;  }  nav ul li a:hover,  nav ul li a.active {    color: #000;    background: none;  }  nav ul li a::before {    position: absolute;    top: 65%;    left: 50%;    color: transparent;    content: '.';    text-shadow: 0 0 transparent;    font-size: 1.7em;    -webkit-transition: text-shadow 0.3s, color 0.3s;    -moz-transition: text-shadow 0.3s, color 0.3s;    -o-transition: text-shadow 0.3s, color 0.3s;    transition: text-shadow 0.3s, color 0.3s;    -webkit-transform: translatex(-50%);    -moz-transform: translatex(-50%);    -ms-transform: translatex(-50%);    -o-transform: translatex(-50%);    transform: translatex(-50%);    pointer-events: none;  }  nav ul li a:hover::before,  nav ul li a:focus::before,  nav ul li a.active::before {    color: #fff;    text-shadow: 10px 0 #000, -10px 0 #000;  }  /* logo */    .logo {    position: absolute;    left: 50%;    margin: 7px -90px 0;  }  .logo img {    width: 75%;  }  .clearfix:before,  .clearfix:after,  .dl-horizontal dd:before,  .dl-horizontal dd:after,  .container:before,  .container:after,  .container-fluid:before,  .container-fluid:after,  .row:before,  .row:after,  .form-horizontal .form-group:before,  .form-horizontal .form-group:after,  .btn-toolbar:before,  .btn-toolbar:after,  .btn-group-vertical > .btn-group:before,  .btn-group-vertical > .btn-group:after,  nav:before,  nav:after,  .nav:before,  .nav:after,  .navbar:before,  .navbar:after,  .navbar-header:before,  .navbar-header:after,  .navbar-collapse:before,  .navbar-collapse:after,  .pager:before,  .pager:after,  .panel-body:before,  .panel-body:after,  .modal-footer:before,  .modal-footer:after {    display: table;    content: " ";  }  .clearfix:after,  .dl-horizontal dd:after,  .container:after,  .container-fluid:after,  .row:after,  .form-horizontal .form-group:after,  .btn-toolbar:after,  .btn-group-vertical > .btn-group:after,  nav:after,  .nav:after,  .navbar:after,  .navbar-header:after,  .navbar-collapse:after,  .pager:after,  .panel-body:after,  .modal-footer:after {    clear: both;  }
<header>    <div class="top-menu">      <nav>        <ul class="nav">          <li><a class="home active">inicio</a>          </li>          <li><a class="services scroll">servicios</a>          </li>          <li><a class="aboutus">sobre nosotros</a>          </li>        </ul>      </nav>      <a class="logo">        <img src="//static.inmopaco.tk/images/logo.png">      </a>      <nav>        <ul class="nav">          <li><a class="home">inscripción</a>          </li>          <li><a class="services">acceso</a>          </li>        </ul>      </nav>      <div class="clearfix"></div>    </div>  </header>


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