body, html{
    height: 100%;
}

body{
    margin:0;
    padding: 0;
    display: flex;
    flex-direction: column;

}
header{
    flex-shrink: 1;
    padding: 5px;
    background-color: cadetblue;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}
@media (min-width: 500px) {
    .content{
        flex: 1 1 auto;
        display: flex;
        justify-content: center;
    }
}

.content{
    flex: 1 1 auto;
    padding: 5px;
    background-color: #c7e7f2;
}

.content_column{
    display: flex;
    flex-direction: row;
}


.footer{
    flex-shrink: 1;
    padding: 5px;
    background-color: cadetblue;
}

.boxcontent{
    border: 1px solid cadetblue;
    flex-basis: 30%;
    margin: 2px;
}