<style>
Header, Header * {
  box-sizing: border-box;
  position: relative;
  display: flex;
  flex-direction: column;
}

.Header {
  flex-grow: 0;
  flex-shrink: 0;
  flex-direction: row;
  background: #333;
  align-items: center;
}

  .Logo {
    flex-grow: 0;
    flex-shrink: 1;
    min-width: 80px;
    height: 80px;
    flex-direction: row;
    flex-wrap: wrap;
    overflow: hidden;
  }

    .LogoIcon {
      flex-grow: 1;
      flex-shrink: 0;
      font-size: 64px;
      text-align: center;
      padding: 0 10px;
    }

    .LogoText {
      flex-grow: 0;
      flex-shrink: 1;
      margin: 0;
      padding: 20px;
      font: 900 32px sans-serif;
      color: #fff;
    }

  .Center {
    flex-grow: 1;
    flex-shrink: 1;
    flex-basis: 800px;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
  }

    .Links {
      flex-direction: row;
      flew-wrap: wrap;
      align-items: center;
      flex-grow: 4;
      flex-shrink: 1;
      min-width: 50%; 
      overflow-x: auto;
    }
  
      .Link {
        margin: 0;
        padding: 20px;
        font: 600 20px sans-serif;
        color: #fff;
        text-decoration: none;
      }

      .Search {
        flex: 1;
        max-width: 200px;
        min-width: 100px;
        border: 0;
        border-radius: 6px;
        padding: 10px 20px;
        margin: 10px 20px;
        font-size: 20px;
        background: #444;
      }
  
      .LinkGradient {
        content: "";
        position: absolute;
        top: 0;
        bottom: 0;
        width: 40px;
      }
      .LinkGradient-left {
        left: 0;
        background: linear-gradient(to left, rgba(51, 51, 51, 0), rgba(51, 51, 51, 1));
      }
      .LinkGradient-right {
        right: 0;
        background: linear-gradient(to right, rgba(51, 51, 51, 0), rgba(51, 51, 51, 1));
      }

    .Networks {
      flex-grow: 1.5;
      flex-shrink: 0;
      min-width: calc(64px * 2 + 40px);
      flex-direction: row;
      flex-wrap: wrap;
      max-height: 64px;
    }

      .Network {
        flex-grow: 1;
        justify-content: center;
        align-items: center;
        padding: 10px 6px; 
      }
</style>
<header class="Header">
  
  <div class="Logo">
    <div class="LogoIcon">♥️</div>
    <div class="LogoText">Logo</div>
  </div>

  <div class="Center">
    <div class="Links">
      <a href="#" class="Link">Lien</a>
      <a href="#" class="Link">Lideux</a>
      <a href="#" class="Link">Limoche</a>
      <a href="#" class="Link">Libeau</a>
      <input placeholder="Search" class="Search" />
    </div>

    <div class="Networks">
      <a class="Network">👴</a>
      <a class="Network">🐦</a>
      <a class="Network">📸</a>
      <a class="Network">📌</a>
    </div>
    
    <div class="LinkGradient LinkGradient-left"></div>
    <div class="LinkGradient LinkGradient-right"></div>
  </div>

</header>