.ulHeader {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

.liHeader {
  float: left;
  border-right:1px solid #bbb;
}

liHeader:last-child {
  border-right: none;
}

.liHeader a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.liHeader a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #4CAF50;
}
</style>
    <style>
      html, body {
      min-height: 100%;
      }
      body, div, form, input, select, p { 
      padding: 0;
      margin: 0;
      outline: none;
      font-family: Roboto, Arial, sans-serif;
      font-size: 14px;
      color: #666;
      }
      h1 {
      margin: 0;
      font-weight: 400;
      }
      h3 {
      margin: 12px 0;
      color: #8ebf42;
      }
      .main-block {
      display: flex;
      justify-content: center;
      align-items: center;
      background: #fff;
      }
      form {
      width: 100%;
      padding: 20px;
      }
      fieldset {
      border: none;
      border-top: 1px solid #8ebf42;
      }
      .account-details, .personal-details {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      }
      .account-details >div, .personal-details >div >div {
      display: flex;
      align-items: center;
      margin-bottom: 10px;
      }
      .account-details >div, .personal-details >div, input, label {
      width: 100%;
      }
      label {
      padding: 0 5px;
      text-align: right;
      vertical-align: middle;
      }
      input {
      padding: 5px;
      vertical-align: middle;
      }
      .checkbox {
      margin-bottom: 10px;
      }
      select, .children, .gender, .bdate-block {
      width: calc(100% + 26px);
      padding: 5px 0;
      }
      select {
      background: transparent;
      }
      .gender input {
      width: auto;
      } 
      .gender label {
      padding: 0 5px 0 0;
      } 
      .bdate-block {
      display: flex;
      justify-content: space-between;
      }
      .birthdate select.day {
      width: 35px;
      }
      .birthdate select.mounth {
      width: calc(100% - 94px);
      }
      .birthdate input {
      width: 38px;
      vertical-align: unset;
      }
      .checkbox input, .children input {
      width: auto;
      margin: -2px 10px 0 0;
      }
      .checkbox a {
      color: #8ebf42;
      }
      .checkbox a:hover {
      color: #82b534;
      }
      button {
      width: 100%;
      padding: 10px 0;
      margin: 10px auto;
      border-radius: 5px; 
      border: none;
      background: #8ebf42; 
      font-size: 14px;
      font-weight: 600;
      color: #fff;
	  cursor: pointer;
      }
	  
      button:hover {
      background: #82b534;
      }
      @media (min-width: 568px) {
      .account-details >div, .personal-details >div {
      width: 50%;
      }
      label {
      width: 40%;
      }
      input {
      width: 60%;
      }
      select, .children, .gender, .bdate-block {
      width: calc(60% + 16px);
      }
      }