I'm doing a site but the div container I put margin auto and it does not work
.servicios{
background: #fff;
height: 750px;
clear: both;
width: 100%;
float: left;
margin: auto;
}
.title-service{
font-size: 70px;
text-align: center;
font-weight: bolder;
clear: both;
color: #bdc3c7;
padding-top:50px;
margin: auto;
}
.servicios hr{
height: 10px;
background: #E9CA1E;
border: none;
width: 100px;
margin: auto;
margin-bottom: 20px;
}
.contenido-serv{
width: 100%;
margin:0 auto;
float: left;
}
.aut-ind{
background: #ecf0f1;
width:300px;
float: left;
position: relative;
margin:0 auto;
}
.importacion-ind{
background: #ecf0f1;
width:300px;
float: left;
position: relative;
margin:0 auto;
}
.asesoramiento{
background: #ecf0f1;
width:300px;
float: left;
position: relative;
margin:0 auto;
}
<section class="servicios">
<p class="title-service">SERVICIOS</p>
<hr class="linea-servicio">
<div class="contenido-serv">
<div class="aut-ind">
<article class="">
<img src="industria.jpg" alt="" height=250px width="300px" >
<p class="titulos">AUTOMATIZACION INDUSTRIAL</p>
<p>Lorem ipsum dolor sit amet, consectetuer
<br>adipiscing elit.Aenean commodo ligula eget
<br>dolor. Aenean massa. Cum sociis natoque
<br>penatibus et magnis dis parturient montes,
<br>nascetur ridiculus mus. Donec quam felis,
</p>
</article>
</div>
<div class="importacion-ind">
<img src="container.jpg" alt="" height="250px" width="300px">
<p class="titulos">IMPORTACION</p>
<p>Lorem ipsum dolor sit amet, consectetuer
<br>adipiscing elit.Aenean commodo ligula eget
<br>dolor. Aenean massa. Cum sociis natoque
<br>penatibus et magnis dis parturient montes,
<br>nascetur ridiculus mus. Donec quam felis,
</p>
</div>
<div class="asesoramiento">
<img src="asesoramiento.jpg" alt="" height="250px" width="300px">
<p class="titulos">ASESORAMIENTO TECNICO</p>
<p>Lorem ipsum dolor sit amet, consectetuer
<br>adipiscing elit.Aenean commodo ligula eget
<br>dolor. Aenean massa. Cum sociis natoque
<br>penatibus et magnis dis parturient montes,
<br>nascetur ridiculus mus. Donec quam felis,
</p>
</div>
</div>
</section>