body {
  background-color: rgb(77, 85, 108);/*#f2f2f2;*/
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

header {
  background-color: rgb(0, 0, 0);
  padding: 10px 0;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: space-around;
}

nav ul li {
  margin-right: 20px;
}

nav ul li a {
  color: 4CAF50;
  text-decoration: none;
  font-size: large;
}

nav ul li a:hover{
  color: 45a049;
}

main {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 80vh;
}

.login-form {
  background-color: white;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
  width: 60%;
  max-width: 600px;
  height: 90%;
  min-height: 500px;
  max-height: 500px;
  margin-top: 2%;
}

.login-form h2 {
  margin-top: 3%;
}

.form-group {
  margin-bottom: 10%;
}

label {
  display: block;
  margin-bottom: 5px;
}

input[type="text"],
input[type="password"] {
  border: 1px solid #ccc;
  border-radius: 3px;
  margin-block: 2%;
  width: 90%;
  padding: 1%;
  font-size: x-large;  
}

input:focus{
  border: 4px solid #4CAF50;
}

button {
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  margin-top: 3%;
  width: 90%;
  height: 50px;
  font-size: x-large;
}

button:hover {
  background-color: #45a049;
}

footer {
  background-color: black;
  color: white;
  padding: 20px 0;
  display: flex;
  justify-content: space-around;
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4%;
}

.footer-block {
  width: 30%;
  text-align: center;
}


.leftmenu{
  background-color: rgb(77, 85, 108);
  color: rgb(251, 252, 200);
  height: 100%;
  margin-top: 10%;
}

.leftmenu input{
  background-color: #4CAF50;
  color: white;
  font-size: large;
  cursor: pointer;
  border: 0;
  border-radius: 5px;
  height: 5%;
  width: 94%;
  margin: 3%
}

.leftmenu input:hover{
    background-color: #45a049;
}

@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
  }

  nav ul li {
    margin: 5px 0;
  }

  .footer-block {
    width: 100%;
  }
}