html {
    background-color: #1F2937;
    color: white;
    font-family: Roboto, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
body {
    margin: auto auto;
    text-align: center;
}
/* header */
nav {
    display: flex;
    width: 75%;
    margin: 16px auto;
    padding: auto auto;
    justify-content: space-between;
    align-content: space-between;
}
#logo {
    font-size: 24px;
    color: #F9FAF8;
    padding: 0 361px 0 0;
    margin: 0 0 0 0;
}
a {
    font-size: 16px;
    font-weight: 500;
}
.menu {
    font-size: 18px;
    font-weight: lighter;
    color: #E5E7EB;
    text-decoration: none;
    position: relative;
}
.btn {
    text-align: center;
    display: inline-block;
    position: relative;
    color: white;
    background-color: #3882F6;
    font-family: 'Roboto', sans-serif;
    font-size: 18px;
    padding: 8px 0px;
    width: 120px;
    border-radius: 8px;
    text-decoration: none;
}
.button-with-border {
    border: 1px solid white;
}
.menu::before {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 2px;
    background-color: #3882F6;
    transition: width 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}
main {
    display: flex;
    justify-content: center;
    margin-top: 100px;
}
/* first block */
.header_text {
    width: 75%;
    align-items: center;
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    align-content: space-around;
}
#head_main_title {
    width: 438px;
    font-size: 48px;
    line-height: 55px;
    font-weight: bolder;
    color: #F9FAF8;
    margin: 0 0 7px 0;
    padding: 0 0 0 0;
}
.text_area {
    text-align: left;
    display: block;
    flex-direction: column;
    justify-content: space-between;
    align-content: space-between;
}
#head-secondary-text {
    width: 438px;
    font-size: 18px;
    font-weight: lighter;
    margin: 0 0 8px 0;
    padding: 0 0 0 0;
}
#place-holder-for-image {
    width: 464px;
    height: 230px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 300;
}
/* second block */
#white_background {
    background-color: white;
    margin-top: 330px;
    width: 100%;
    position: absolute;
    display: block;
}
#information_text {
    font-weight: bolder;
    font-size: 36px;
    color: #1F2937;
    padding-top: 24px;
}
figure {
    width: 110px;
    margin: 0 0 0 0;
}
.place-holder-for-illustration {
    height: 150px;
    width: 150px;
    background-color: #fff;
    border-radius: 10px;
    border: 2px solid #3882F6;
}
.picture-info {
    color: gray;
    font-size: 12px;
    width: 150px;
    height: auto;
    margin-top: 8px;
}
.container {
    width: 50%;
    height: auto;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    margin: auto;
    padding-top: 24px;
    padding-bottom: 80px;
}
/* third block */
.gray-box {
    background-color: #E5E7EB;
    width: 100%;
    display: flex;
    flex-direction: column;
}
article {
    width: 46%;
    color: black;
    margin: auto auto;
}
#text-article {
    text-align: left;
    font-size: 28px;
    font-style: italic;
    font-weight: 300;
    color: #1F2937;
    padding: 70px 0 0 0;
}
#text-author {
    text-align: right;
    color: #1F2937;
    margin-right: 29%;
    padding-bottom: 70px;
}
/* fourth block */
.call-to-action-box {
    background-color: #3882F6;
    border-radius: 10px;
    width: 64%;
    margin: 60px auto;
    align-items: center;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-content: space-around;
}
#text-line {
    text-align: left;
    display: block;
    flex-direction: column;
    justify-content: space-between;
    align-content: space-between;
}
#call-to-action-title {
    font-size: 16px;
    font-weight: 500;
    margin: 0 0 0 0;
    padding-top: 25px;
}
#call-to-action-text {
    font-size: 12px;
    font-weight: 200;
    margin: 0 0 0 0;
    padding-bottom: 25px;
}
/* footer */
#copyright {
    display: flex;
    justify-content: center;
    padding-top: 960px;
    padding-bottom: 30px;
}