* {
    box-sizing: border-box;
}
html {
    background-color: #EBEBEB;
    font-family: sans-serif, arial;
}
.main_container {
    max-width: 960px;
    margin: 30px auto;
    background-color: #F7F7F7;
    padding: 0 5%;
    border: 20px solid #EBEBEB;
}
p {
    line-height: 1.5em;
    text-align: left;
}
h1 {
    padding-bottom: 13px;
    border-bottom: 2px dotted black;
    text-align: center;
}
.column {
    width: 50%;
    float: left;
    padding: 0 10px;
}
.group:after {
    content: "";
    display: table;
    clear: both;
}
@media screen and (max-width: 720px) {
    .column {
        width: 100%;
    }
}