@import url(https://fonts.googleapis.com/css?family=Open+Sans);

* { box-sizing: border-box; }

body {
    font-family: 'Open Sans', sans-serif;
    color: #666;
}

/* STRUCTURE */

.wrapper {
    padding: 5px;
    max-width: 960px;
    width: 95%;
    margin: 20px auto;
}
header {
    padding: 0 15px;
}

.columns {
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
    margin: 5px 0;
}

.column {
    flex: 1;
    /*border: 1px solid gray;*/
    margin: 2px;
    padding: 10px;
&:first-child { margin-left: 0; }
&:last-child { margin-right: 0; }

}

footer {
    padding: 0 15px;
}


@media screen and (max-width: 980px) {
    .columns .column {
        margin-bottom: 5px;
        flex-basis: 40%;
&:nth-last-child(2) {
     margin-right: 0;
 }
&:last-child {
     flex-basis: 100%;
     margin: 0;
 }
}
}

@media screen and (max-width: 680px) {
    .columns .column {
        flex-basis: 100%;
        margin: 0 0 5px 0;
    }
}