style1.css

* {
    margin: o;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

.center {
    display: flex;
    flex-wrap: wrap;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2%;
}

html,
body {
    height: 100%;
    overflow-y: hidden;
    overflow-x: hidden;
}

.header {
    height: 200px;
    padding: 20px 0;
}

.logo {
    width: 50%;
}

.logo img {
    max-width: 200px;
    max-height: 150px;
    width: auto;
    height: auto;
    margin-left: -15%;
}

.menu {
    padding-top: 30px;
    width: 50%;
    text-align: right;
}

.menu a {
    color: black;
    text-decoration: none;
    font-weight: bold;
    margin-right: 15px;
}

section.sobre {
    height: calc(100% - 200px);
    position: relative;
}

.extras {
    position: absolute;
    bottom: -180px;
    right: -180px;
    width: 700px;
    height: 700px;
    border-radius: 50%;
    background-color: #017143;
}

.extras img {
    max-width: 400px;
    max-height: 400px;
    margin: 2%;
    margin-left: -2%;
    margin-top: 45%;
    padding: 2%;
    display: block;
    width: 70%;
    vertical-align: -80%
    }
    .texto-sobre {
        color:#017143;
        font-size: 20px;
        text-align: justify;
        max-width: 800px;
   }