.lesson_full {
  display: flex;
}

body {
  /* background-color: rgb(247, 247, 248); */
}

.header {   
  background-image: linear-gradient(#063785, #1483f6);  
  color: #fff;    
  padding-bottom: 5px;  
}

/* .p_heder1{
  padding-top: 10px;
  font-size: 20px;
  text-align: center;
}

.p_heder2{
  margin-left: 10px;
  font-size: 30px;
} */

h1{
  color: rgb(232, 232, 245);
  font-size: 28px; 
}

h2{  
  font-size: 28px; 
  text-align: center;
}

h3{  
  font-size: 26px; 
  /* text-align: center; */
}

.menu_les_1{
  color:#391be2;
  font-size: 20px;  
}

.oglavlenie{
  /* max-width: 180px; */
  min-width: 180px;
  margin-left: 5px;
  margin-top: 5px;
  margin-bottom: 20px;
  padding: 5px;
  background-color: rgb(226, 224, 247);
}

.oglav_zadachi {
  margin-left: 10px;
}

.errors {
  /* margin-left: 10px; */
  margin-top: 20px;
  font-size: 16px;
  font-style: italic;
}

.lesson_nazvanie {
  background-color: #1483f6;
 }

 .lesson_nazvanie2 {
  background-color: #1483f6;
  width: 300px; 
  color: white;
 }

.underli{
  /* margin-left: 10px; */
  text-decoration: underline;
}

.osnova{
  margin: 10px;
  /* border: 1px dotted rgb(57, 14, 248); */
  min-width: 900px;
}

.hidden {
  display: none; 
} 

.input_answer{
  width: 50px;
  margin-left: 10px;
}

.div_z1, .div_z2, .div_z3 {
 width: 950px; 
 /* background-color: rgb(226, 224, 247); */
 padding: 10px;
 margin-bottom: 20px;
 /* background-image: url("/image/fon_math.png"); */
}

.text_z1, .pic_z1, .input_z1{
  margin: 10px;
}

.btn_answer_z1 {
  margin-left: 10px; 
}

.btn_answer_z4, .input_z4, .btn_answer_z5, .input_z5{
  margin-top: 20px;
}

.input_z1 {
  vertical-align: bottom;
  width: 105px;
}

.img_galka {
  width: 25px;
  vertical-align:bottom;
}

/* .footer_les {
  width: 800px; 
  background-color: rgb(205, 247, 221);
 } */

 .footer {   
  background-image: linear-gradient(#1483f6, #063785);  
  color: #fff;    
  padding-bottom: 20px;  
}

.p_footer{
  font-size: 30px;
}