@charset "UTF-8";
/*
Theme Name: My Theme
*/

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.header {
    width: 100%;
    height: 80px;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    background-color: #fff;
}

.header-box {
    width: 900px;
    height: 80px;
    margin: 0 auto;
    background-color: yellow;
}

.main-container {
    width: 900px;
    margin-top: 80px;
}

.box-400 {
    width: 900px;
    height: 400px;
    background-color: gray;
}

.columns-container {
    display: flex;
    width: 900px;
    height: 500px;
}

.col-left {
    width: 600px;
    height: 500px;
    background-color: lightcoral;
}

.col-right {
    width: 300px;
    height: 500px;
    background-color: mediumpurple;
}

.footer {
    width: 100%;
    height: 200px;
    background-color: #fff;
}

.footer-box {
    width: 900px;
    height: 200px;
    margin: 0 auto;
    background-color: yellow;
}