.header, .footer {   
   background-image: linear-gradient(#063785, #1483f6); 
   display: flex;
   color: rgb(250,250,250);   
   /* max-width: 1050px;    */
}

.footer {   
   background-image: linear-gradient(#2d8df3, #042355);    
   margin-top: 10px;
}

.header_1{
    display: block;
    justify-content: space-between;   
    margin-left: 20px;
    margin-top: 5px;
    width: 150px;
    text-align: center;
    font-size: 22px;
}

.header_2{
    text-align: center;
    font-size: 22px;
    width: 800px; 
}

.pic_vk{
    position: absolute;
    left: 800px;
    top: 20px;
}
.zagolovok{
    margin-bottom: 25px;
}

.pic_line{
    margin: 5px 20px;
}
#pic_line{
    height: 220px;
}
body{
    background-color: rgb(212, 211, 211);
}



#work{
    display: none;
}
.tasks{
    background-color: white;
    width: 450px;
    border: 3px solid lime;
    display: inline-block;
}
.result{
    display: inline;
}
.task{
    margin: 10px 1px 10px ;
    height: 30px;
    border: 3px solid green;
    background-color: grey;
}
#error{
    height: 57px;
    border: 3px solid green;
    background-color: grey;
}
#result{
    position: relative;
    height: 54px;
    width: 65px;
    top: 20px;
    background-color: grey;
    border: 2px solid lime;
}

.content{
    display: flex;   
}

.oglav{   
    background-image: linear-gradient(#b3caee, #eaeef3); 
    margin-top: 15px;
    padding: 10px;
    width: 170px; 
    background-color: rgb(253, 251, 251);       
    border: 2px solid #6ca5fa;
    border-radius: 5px;
}

.oglav_tema{
  font-size: 20px;
  color: blue;
  margin: 25px 5px 5px 5px;     
}

.oglav_paragraf{
  font-size: 14px;  
  margin: 5px 5px 5px 5px;     
}

.oglav_paragraf_active{
  font-size: 16px;
  color: lab(49.91% 74.08 58.23);
  font-weight: bold;
  margin: 10px 5px 5px 5px;     
}

.section1, .section2{
    margin-top: 15px;
    margin-left: 5px;
    padding: 20px;
    width: 810px; 
    background-color: rgb(253, 251, 251);     
    border: 2px solid #6ca5fa;
    border-radius: 5px;
    min-height: 950px;
}

.zagolovok1{ 
    font-size: 34px;
    color: blue;
    text-align: center;
    margin-bottom: 30px;    
}

.zagolovok2{    
    font-size: 30px;
    color: blue;    
    margin-bottom: 10px;  
    margin-top: 30px;  
}

.zagolovok3{    
    font-size: 24px;
    color: blue;    
    margin-bottom: 10px;    
}

.zagolovok4{    
    font-size: 18px;
    color: blue;    
    margin-bottom: 10px;  
    margin-top: 10px;   
}

button{
    background-color: rgb(125, 123, 248);
    background-size: 50px 20px;
    margin: 16px;
}

input{
    margin: 15px;
}

#elem{
    font-size: 50px;
    text-align: center;
    background-color: grey;
    /* display: list-item; */
    display: inline-block;
}

img{
    object-fit: none;
}