Как исправить код

 @import url('https://fonts.googleapis.com/css2?family=Lexend+Deca:wght@100..900&display=swap'); 
html, body{ 
    margin: 0; 
    background-color: #FBF3F1; 
  } 
  header{    
  display:flex;    
  justify-content:space-between;    
  align-items:center;    
  background-color: #BBA389;}    
  .header_text{    
  color: white;    
  } 
  .header_text{ 
    color:#4A4A4A; 
    text-decoration: none; 
    font-family: "Inter", serif; 
    font-optical-sizing: auto; 
    font-weight: weight; 
    font-style: normal; 
  } 
  .lang_text{    
  color: #4A4A4A; 
  text-decoration: none; 
  font-family: "Inter", serif; 
  font-optical-sizing: auto; 
  font-weight: weight; 
  font-style: normal; 
  }    
  header ul {    
  display: flex;    
  list-style: none;    
  margin: 0px;    
  padding: 0px;    
  margin-right: 10px;    
  }    
  header li { display: block; margin-right: 10px;}    
  header li + li { margin-left: 10px; }    
  .logo {    
  display: block;    
  width: 57px;    
  height: 77px;    
    margin-left:81px; 
  margin-right: 36px;}    
  .menu { flex: 1 0;}    
  .lang {  
    flex: 0 0; 
    padding-right: 38px; 
} 
.back{ 
	filter: brightness(50%); 
  background: url(/img/background.png) center center no-repeat ; 
    background-size: cover; 
    padding: 75px 0 590px 0; 
} 
.back_text{ 
  font-family: "Lexend Deca", serif; 
  font-optical-sizing: auto; 
  font-weight: 900; 
  font-style: normal; 
  padding-left: 10px; 
  color:#FFFFFF; 
}