main.css

body {
    padding: 0;
    margin: 0;
    max-width: 1366px;
    font-family: 'Oswald', sans-serif;
}

.header__container {
    height: 100vh;
    background-color: #111111;
}

.header__container-menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    padding-left: 180px;
    padding-top: 53px;
}

.header__container-menu-menu {
    padding-left: 463px;
}

.header__container-menu-logo p {
    font-size: 18px;
    font-weight: 700;
    color: #fff;
}

.header__container-menu-logo p:hover {
    color: #FCAC45;
}

.menu {
    display: flex;
    list-style-type:none;
}

.menu li {
    color: #fff;
    font-size: 14px;
    font-weight: bold;
    text-transform: uppercase;
    padding-right: 27px;
}

.menu li a {
    text-decoration: none;
    color: #fff;
    padding-bottom: 10px;
    border-bottom: 3px solid #222222;
    box-sizing: border-box;
} 

.menu li a:hover {
    text-decoration: none;
    color: #fff;
    padding-bottom: 10px;
    border-bottom: 3px solid #FCAC45;
    box-sizing: border-box;
}

.header__container-start {
    display: flex;
    justify-content: center;
    padding-top: 200px;
}

.header__container-start-welcome {
    text-align: center;
}

.header__container-start-welcome h3 {
    font-size: 43px;
    text-transform: uppercase;
    color: #999999;
    margin-bottom: 0;
}

.header__container-start-welcome h3 span {
    color: #FCAC45;
}

.header__container-start-welcome p {
    margin-top: 0;
    font-size: 20px;
    color: #D4D4D4;
}

.header__container-start-welcome p b {
    color: #d2d2d2;
}

.header__container__circle {
    display: flex;
    justify-content: center;
    padding-top: 100px;
}

.circle i {
    border: 1px solid #B7B7B7;
    border-radius: 50%;
    padding: 10px 10px;
    color: #B7B7B7;
}

/* about */

.about {
    height: 90vh;
}

.about__container {
    display: flex;
    flex-direction: row;
}

.about__container-mac {
    padding-left: 142px;
}

.about__container-about {
    display: flex;
    flex-direction: column;
    width: 400px;
    padding-top: 53px;
    padding-left: 146px;
}

.about__container-about-first {
    margin-bottom: 0;
    font-size: 18px;
    font-family: open sans;
    text-transform: uppercase;
    font-weight: 100;
    color: #6A6A6A;
}

.about__container-about-second {
    margin-top: 0;
    font-size: 30px;
    font-family: open sans;
    text-transform: uppercase;
    font-weight: 100;
    color: #000;
    position: relative;
}

.about__container-about-second:after {
    content: "";
    position: absolute;
    display: block;
    width: 80px;
    height: 3px;
    background: #FCAC45;
    margin: 10px auto;
}

.about__container-about-third {
    width: 400px;
    font-family: open sans;
    color:#939393;
    margin-top: 0;
}

.about__container-about-list-first {
    color: #939393;
}

.about__container-about-list-second {
    color: #939393;
}

.about__container-about-list-third {
    color: #939393;
}

.about__container-about-list-first b {
    color: #6C6C6C;
}

.about__container-about-list-second b {
    color: #6C6C6C;
}

.about__container-about-list-third b {
    color: #6C6C6C;
}

.about__container-about-list-second {
    margin-top: 0;
}

.about__container-about-list-third {
    margin-top: 0;
}

.about-button {
    background: #fff;
    border: 1px solid #AEAEAE;
    border-radius: 3px;
    width: 153px;
    padding: 15px 10px;
    color: #797979;
    font-size: 13px;
    font-weight: 600;
    font-family: open sans;
}

.about-button:hover {
    background: #797979;;
    border: 1px solid #AEAEAE;
    border-radius: 3px;
    width: 153px;
    padding: 15px 10px;
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    font-family: open sans;
}

/* team */

.team {
    height: 100vh;
    background: #070707;
}

.team__container {
    display: flex;
    justify-content: center;
}

.team__container p {
    font-size: 53px;
    color: #BABABA;
    font-weight: 100;
    font-family: open sans;
}
.team__container-meet {
    position: relative;
}

.team__container-meet:after {
    content: "";
    position: absolute;
    width: 80px;
    height: 2px;
    background: #FCAC45;
    margin-top: -30px;
    margin-left: 145px;
}

.team__container p b {
    color: #fff;
}


.team__container-all {
    display: flex;
    flex-direction: row;
    padding-top: 104px;
    padding-left: 200px;
}

.team__container-first {
    display: flex;
    color: #fff;
    flex-direction: column;
}

.team__container-first_circle {
    display: flex;
    padding-right: 163px;
}

.team__container-first_name {
    text-align: center;
    margin-left: -100px; /* I know that is not correct. You can help me with this mistake*/
    width: 300px;
}

.team__container-first_name h4 {
    font-size: 20px;
    color: #e9e9e9;
}

.team__container-first_name p {
    font-size: 14px;
    font-family: open sans-serif;
}

/* clients */

.clients {
    height: 60vh;
    background: #070707;
}

.clients__mainContainer-title {
    position: relative;
    color: #fff;
    font-family: open sans;
    display: flex;
    justify-content: center;
    font-size: 43px;
    font-weight: 100;
    text-transform: uppercase;
    padding-top: 59px;
}

.clients__mainContainer-title:after {
    content: "";
    position: absolute;
    width: 80px;
    height: 2px;
    background: #FCAC45;
    margin-top: 90px;
    margin-left: -15px;
}

.clients__mainContainer-title p {
    margin-top: 0;
}

.clients__mainContainer-clients {
    display: flex;
    justify-content: center;
}