body {
    max-width: 968px;
    margin: auto;
}

.container {
    border: 1px solid #ddd;
    padding: 1em;
    margin-top: 1em;
    margin-bottom: 1em;
}

img {
    max-width: 100%;
}

.header-img-mobile {
    display: none;
}

.align-center {
    text-align: center;
}

form {
    margin-top: 1em;
}

.margin-top-1em {
    margin-top: 1em;
}

.margin-top-2em {
    margin-top: 2em;
}

.margin-top-3em {
    margin-top: 3em;
}

h3 {
    color: #70b2d2;
}

hr {
    margin: 1em;
}

.concern{
    line-height: .5em;
}

.alert {
    color: #941c12;
}

.error {
    color: darkred;
    font-size: .9em;
}

.concernError{
    display: none;
    margin-bottom: 1em;
    text-align: left;
}

.optinError{
    display: none;
    margin-bottom: 1em;
    text-align: left;
}

/* Larger than phablet (also point when grid becomes active) */
 @media screen and ( max-width : 548px ) {
     .header-img {
    display: none;
    }
     .header-img-mobile {
    display: inline;
    }
        .preocupaciones{
           margin-top:0;
}