* {
  box-sizing: border-box;
}

input[type=text], select, textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 4px;
  resize: vertical;
}

label {
  padding: 12px 12px 12px 0;
  display: inline-block;
  font-weight: bold;
}

input[type=submit] {
  background-color: #4CAF50;
  color: white;
  padding: 12px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  float: right;
}

input[type=submit]:hover {
  background-color: #45a049;
}

.container {
  border-radius: 5px;
  padding: 20px;
  max-width:1024px;
  margin:auto;
}

.form_back {
  background-color: #f2f2f2;
  font-size: 0.9em;
  border-radius: 5px;
  padding: 20px;
  margin:auto;
}

.col-25, .col-25-fixed {
  width: 25%;
}

.col-75, .col-75-fixed {
  width: 75%;
}

.col-50, .col-50-fixed {
  width: 50%;
}

.col-25, .col-25-fixed, .col-50, .col-50-fixed, .col-75, .col-75-fixed {
  float: left;
  padding: 6px;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

h1 {
  color: #212529;
  font-size: 3em;
  font-weight: bold;
}

h2 {
  color: #212529;
  font-size: 2em;
  font-weight: bold;
}

h3 {
  color: #212529;
  font-size: 1em;
  text-align: justify;
}

.note {
  color: #585858;
  font-size: .8em;
  text-align: justify;
}

esp {
  color: #C0C0C0;
}

.form_title {
  text-align: center;
}

.center {
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;  
}

.btn {
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;  
  display: inline-block;
  font-weight: 400;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  user-select: none;
  border: 1px solid transparent;
  padding: .375rem .75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: .25rem;
  transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

/* Responsive layout - when the screen is less than 600px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .col-25, .col-75, .col-50, input[type=submit] {
    width: 100%;
    margin-top: 0;
    padding: 0px;
  }
  .col-25-fixed, .col-75-fixed, .col-50-fixed {
    margin-top: 0;
    padding: 0px;
  }
  h1 {
    font-size: 2em;
  }
  h2 {
    font-size: 1.5em;
  }
  h3, form {
    font-size: 0.8em;
  }
}