/* Box Model Hack */
*{
  box-sizing: border-box;
}

/******************************************
/* LAYOUT
/*******************************************/
html {
    font-size: 62.5%;
}
h1, h2, p{
  text-align: center;
}
h1 {
    font-size: 4rem;
}
h2 {
    font-size: 2.6rem;
}
p {
    font-size: 1.8rem;
    line-height: 2.7rem;
}
img{
    display: block;
    height: 300px;
    margin: 0 auto;
}
col-1-2 {
  display: inline-block;
  width: 50%;
}
.prime{
    margin: 0 auto;
    border: 3px solid #000;
    color: #000;
    padding: 1rem;
    width: 100px;
}
section p {
    font-size: 1.8rem;
    font-weight: 700;
}
ul{
    width: 100px;
    border: 3px solid black;
    margin: 0 auto;
    list-style: none;
    padding: 0;
}
li{
    text-align: center;
    font-size: 1.6rem;
    line-height: 49px;
    width: 94px;
    height: 49px;
    border: 1px solid black;
}