body {
  /*background-color: #ccffcc;*/
  font-family: sans-serif;
  padding: 16px 0;
  text-align: center;
}

select {
  background-color: white;
  border: thin solid green;
  border-radius: 5px;
  display: inline-block;
  font-family: sans-serif;
  font-size: 16px;
  line-height: 20px;
  padding: 8px 70px 8px 16px;
  width: 220px;

  margin: 0;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  -webkit-appearance: none;
  -moz-appearance: none;
}

select.minimal {
  background-image:
    linear-gradient(45deg, transparent 50%, gray 50%),
    linear-gradient(135deg, gray 50%, transparent 50%),
    linear-gradient(to right, #ccc, #ccc);
  background-position:
    calc(100% - 20px) calc(1em + 2px),
    calc(100% - 15px) calc(1em + 2px),
    calc(100% - 2.5em) 0.5em;
  background-size:
    5px 5px,
    5px 5px,
    1px 1.5em;
  background-repeat: no-repeat;
}

select.minimal:focus {
  background-image:
    linear-gradient(45deg, green 50%, transparent 50%),
    linear-gradient(135deg, transparent 50%, green 50%),
    linear-gradient(to right, #ccc, #ccc);
  background-position:
    calc(100% - 15px) 1em,
    calc(100% - 20px) 1em,
    calc(100% - 2.5em) 0.5em;
  background-size:
    5px 5px,
    5px 5px,
    1px 1.5em;
  background-repeat: no-repeat;
  border-color: green;
  outline: 0;
}

select option:first-child {
  color: gray;
}
select:invalid {
  color: gray;
}
select option {
  color: #000000;
}

.textbox {
  background-color: white;
  border: thin solid green;
  border-radius: 5px;
  display: inline-block;
  font-family: sans-serif;
  font-size: 16px;
  line-height: 20px;
  padding: 8px 70px 8px 16px;
  width: 132px;
}

.button_login {
  background-color: green;
  border: thin solid green;
  border: 1px solid green;
  color: white;
  font-weight: bold;
  border-radius: 5px;
  display: inline-block;
  font-family: sans-serif;
  font-size: 16px;
  line-height: 20px;
  padding: 8px 0px 8px 0px;
  width: 220px;
}
input[type="submit"]:hover {
    color: green;
    background-color: #ffffff;
    border: 1px solid green;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 1s;
}

@media screen and (max-width: 480px) {
  body {
    /*background-color: #ccffcc;*/
    font-family: sans-serif;
    font-size: 12px;
    padding: 8px 0;
    text-align: center;
  }

  select {
    background-color: white;
    border: thin solid green;
    border-radius: 5px;
    display: inline-block;
    font-family: sans-serif;
    font-size: 16px;
    line-height: 20px;
    padding: 8px 70px 8px 16px;
    width: 220px;

    margin: 0;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-appearance: none;
    -moz-appearance: none;
  }

  select.minimal {
    background-image:
      linear-gradient(45deg, transparent 50%, gray 50%),
      linear-gradient(135deg, gray 50%, transparent 50%),
      linear-gradient(to right, #ccc, #ccc);
    background-position:
      calc(100% - 20px) calc(1em + 2px),
      calc(100% - 15px) calc(1em + 2px),
      calc(100% - 2.5em) 0.5em;
    background-size:
      5px 5px,
      5px 5px,
      1px 1.5em;
    background-repeat: no-repeat;
  }

  select.minimal:focus {
    background-image:
      linear-gradient(45deg, green 50%, transparent 50%),
      linear-gradient(135deg, transparent 50%, green 50%),
      linear-gradient(to right, #ccc, #ccc);
    background-position:
      calc(100% - 15px) 1em,
      calc(100% - 20px) 1em,
      calc(100% - 2.5em) 0.5em;
    background-size:
      5px 5px,
      5px 5px,
      1px 1.5em;
    background-repeat: no-repeat;
    border-color: green;
    outline: 0;
  }

  select option:first-child {
    color: gray;
  }
  select:invalid {
    color: gray;
  }
  select option {
    color: #000000;
  }

  .textbox {
    background-color: white;
    border: thin solid green;
    border-radius: 5px;
    display: inline-block;
    font-family: sans-serif;
    font-size: 16px;
    line-height: 20px;
    padding: 8px 70px 8px 16px;
    width: 132px;
  }

  .button_login {
    background-color: green;
    border: thin solid green;
    color: white;
    font-weight: bold;
    border-radius: 5px;
    display: inline-block;
    font-family: sans-serif;
    font-size: 16px;
    line-height: 20px;
    padding: 8px 0px 8px 0px;
    width: 220px;
  }
}