#portfolio {
    display: block;
}

#portfolio li {
    display: block;
    float: left;
    width: 30%;
    max-width: 400px;
    margin-right: 20px;
    margin-bottom: 20px;
}

#portfolio li a {
    display: block;
    padding: 8px;
    background: #fff;
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    border-radius: 2px;
    -webkit-box-shadow: 1px 2px 2px rgba(0, 0, 0, 0.25);
    -moz-box-shadow: 1px 2px 2px rgba(0, 0, 0, 0.25);
    box-shadow: 1px 2px 2px rgba(0, 0, 0, 0.25);
}
#portfolio li a:hover{
    background-color: #990000;
}

.mfp-title {
    font-size: 1.2em;
    color: #ddd !important;
    font-weight: 700;
}
/** media queries **/
@media screen and (max-width: 780px) {
    #portfolio li {
        width: 45%;
    }
}

@media screen and (max-width: 550px) {
    #portfolio {
        text-align: center;
    }

    #portfolio li {
        float: none;
        display: inline-block;
        width: 80%;
        margin-bottom: 30px;
    }
}