* {
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
}

@media screen and (min-width: 320px) and (max-width: 479px) {
  div.sign_in {
    background: #999999;
    background-size: cover;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
  }

  div.sign_in div.blue_section p {
    color: #ffffff;
    font-size: 25px;
    line-height: 1.5em;
    font-weight: 500;
    text-transform: uppercase;
    display: block;
  }

  div.sign_in div.login_section {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  div.sign_in div.login_section div.login_form {
    background-color: #ffffff;
    width: 300px;
    height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  div.sign_in div.login_section div.login_form h2 {
    font-size: 25px;
    font-weight: 500;
    line-height: 55px;
    display: block;
    margin-bottom: 50px;
  }

  div.sign_in div.login_section div.login_form input[type="text"]::-webkit-input-placeholder {
    color: #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="password"]::-webkit-input-placeholder {
    color: #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="text"],
  div.sign_in div.login_section div.login_form input[type="password"] {
    width: 250px;
    height: 60px;
    box-sizing: border-box;
    font-size: 25px;
    font-weight: 500;
    line-height: 30px;
    padding: 15px;
    margin-bottom: 35px;
    border: 1px solid #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="password"] {
    margin-bottom: 20px;
  }

  div.sign_in div.login_section div.login_form label {
    margin-bottom: 45px;
    font-size: 18px;
    line-height: 22px;
  }

  div.sign_in div.login_section div.login_form label input[type="checkbox"] {
    border-style: none;
    background-color: #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="button"] {
    width: 250px;
    height: 70px;
    color: #ffffff;
    font-size: 25px;
    line-height: 38px;
    font-weight: 500;
    background-color: #bd696a;
    border-style: none;
  }
}

@media screen and (min-width: 480px) and (max-width: 640px) {
  div.sign_in {
    background: #999999;
    background-size: cover;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
  }

  div.sign_in div.blue_section p {
    color: #ffffff;
    font-size: 25px;
    line-height: 1.2em;
    font-weight: 500;
    text-transform: uppercase;
    display: block;
  }

  div.sign_in div.login_section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  div.sign_in div.login_section div.login_form {
    background-color: #ffffff;
    width: 500px;
    height: 700px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  div.sign_in div.login_section div.login_form h2 {
    font-size: 35px;
    font-weight: 500;
    line-height: 55px;
    display: block;
    margin-bottom: 80px;
  }

  div.sign_in div.login_section div.login_form input[type="text"]::-webkit-input-placeholder {
    color: #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="password"]::-webkit-input-placeholder {
    color: #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="text"],
  div.sign_in div.login_section div.login_form input[type="password"] {
    width: 400px;
    height: 80px;
    box-sizing: border-box;
    font-size: 25px;
    font-weight: 500;
    line-height: 30px;
    padding: 15px;
    margin-bottom: 55px;
    border: 1px solid #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="password"] {
    margin-bottom: 20px;
  }

  div.sign_in div.login_section div.login_form label {
    margin-bottom: 65px;
    font-size: 18px;
    line-height: 22px;
  }

  div.sign_in div.login_section div.login_form label input[type="checkbox"] {
    border-style: none;
    background-color: #e9e9e9;
  }

  div.sign_in div.login_section div.login_form input[type="button"] {
    width: 400px;
    height: 100px;
    color: #ffffff;
    font-size: 25px;
    line-height: 38px;
    font-weight: 500;
    background-color: #bd696a;
    border-style: none;
  }
}

@media screen and (min-width: 641px) {
  div.sign_in {
    width: 100%;
    height: 100%;
    background-color: #e9e9e9;
    text-align: center;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
  }

  div.sign_in div.blue_section {
    background-color: #bd696a;
    width: 35%;
    height: 100%;
    color: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
  }

  div.sign_in div.blue_section p {
    font-size: 35px;
    line-height: 1.6em;
    font-weight: 500;
    height: 18%;
    text-transform: uppercase;
  }

  div.sign_in div.login_section {
    width: 65%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
  }

  div.sign_in div.login_section div.login_form {
    background-color: #ffffff;
    width: 620px;
    height: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  div.sign_in div.login_section div.login_form h2 {
    font-size: 22px;
    font-weight: 700;
    line-height: 30px;
    display: block;
    margin-top: 75px;
    margin-bottom: 60px;
  }

  div.sign_in div.login_section div.login_form input[type="text"],
  div.sign_in div.login_section div.login_form input[type="password"] {
    width: 400px;
    height: 60px;
    border: 1px solid #e9e9e9;
    text-align: left;
    margin-bottom: 25px;
    padding: 15px;
    box-sizing: border-box;
    font-size: 18px;
    font-weight: normal;
  }

  div.sign_in div.login_section div.login_form input[type="checkbox"] {
    width: 15px;
    height: 15px;
    background-color: #e9e9e9;
    border-radius: 0;
    border-style: none;
  }

  div.sign_in div.login_section div.login_form label {
    color: #000000;
    font-size: 14px;
    font-weight: 500;
    line-height: 15px;
    margin-left: -270px;
    margin-bottom: 25px;
    cursor: pointer;
  }

  div.sign_in div.login_section div.login_form input[type="button"] {
    width: 500px;
    height: 60px;
    background-color: #bd696a;
    color: #ffffff;
    font-size: 18px;
    font-weight: 700;
    line-height: 22px;
    text-align: center;
    border-style: none;
    cursor: pointer;
    margin-bottom: 50px;
  }
}