styles.css

h1 {
    color: #ffffff;
    display: block;
    font-family: Arial;
    font-size: 18px;
    font-weight: 700;
    background-color: #00a3ef;
    padding: 12px 20px;
}

body {
    color: #5b594a;
    font-family: arial;
    font-size: 14px;
    font-weight: 300;
    line-height: 21px;
    background-color: #efefef;
}

label {
    line-height: 27px;
}

h2 {
    color: #5b594a;
    font-family: arial;
    font-size: 16px;
    font-weight: 700;
    line-height: 27px;
}

article {
    margin: 20px;
}

.main {
    min-width: 728px;
    max-width: 960px;
    margin: 0 auto;
    display: block;
    width: 80%;
    background-color: #ffffff;
}

.repos {
    margin-left: 20px;
    margin-right: 20px;
    /*    column-count: 2;
    column-gap: 20px; 
    */
}

.group {
    display: block;
    float: left;
    width: 280px;
}

button {
    background-color: #00a3ef;
    color: #ffffff;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
    padding: 15px 25px;
    display: inline-block;
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.2);
}

.center {
    display: block;
    clear: both;
    text-align: center;
    padding: 30px 0 40px 0;
}

.warning {
    color: #00a3ef;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}