:root {
    --color-white: #f3f3f3;
    --color-darkblue: #1b1b32;
    --color-darkblue-alpha: rgba(27, 27, 50, 0.8);
    --color-green: #37af65;
    --color-maroon: #800000;
    --color-med-aqua: #66CDAA;
    --color-salmon: #FA8072;
  }

  *,
*::before,
*::after {
  box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.4;
    color: var(--color-white);
    margin: 0;
  }

  /* mobile friendly alternative to using background-attachment: fixed */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    z-index: -1;
    background: var(--color-darkblue);
    background-image: linear-gradient(
        115deg,
        rgba(58, 113, 158, 0.8),
        rgba(206, 162, 136, 0.7)
      ),
      url(https://images.unsplash.com/photo-1636647677481-f134fda3f408?crop=entropy&cs=tinysrgb&fm=jpg&ixlib=rb-1.2.1&q=80&raw_url=true&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
  }

  h1 {
    font-weight: 400;
    line-height: 1.2;
  }

  p {
    font-size: 1.125rem;
  }

  h1,
p {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

label {
    display: flex;
    align-items: center;
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
  }

  input,
button,
select,
textarea {
  margin: 0;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

button {
    border: none;
  }

  .container {
    width: 100%;
    margin: 3.125rem auto 0 auto;
  }

  @media (min-width: 576px) {
    .container {
      max-width: 540px;
    }
  }
  
  @media (min-width: 768px) {
    .container {
      max-width: 720px;
    }
  }

  .header {
    padding: 0 0.625rem;
    margin-bottom: 1.875rem;
  }

  .description {
    font-style: italic;
    font-weight: 200;
    text-shadow: 1px 1px 1px rgba(0, 0, 0, 0.4);
  }
  
  .clue {
    margin-left: 0.25rem;
    font-size: 0.9rem;
  }

  .txt-cen {
    text-align: center;
  }

  /* form */

form {
    background: var(--color-maroon);
    padding: 2.5rem 0.625rem;
    border-radius: 0.25rem;
  }
  
  @media (min-width: 480px) {
    form {
      padding: 2.5rem;
    }
  }

  .form-unit {
    margin: 0 auto 1.25rem auto;
    padding: 0.25rem;
  }

  .form-cntl {
    display: block;
    width: 100%;
    height: 2.375rem;
    padding: 0.375rem 0.75rem;
    color: #212f3d;
    background-color: #fff;
    -webkit-background-clip: padding-box;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  }

  .input-radio,
.input-checkbox {
  display: inline-block;
  margin-right: 1.625rem;
  min-height: 1.25rem;
  min-width: 1.25rem;
}

.inp-textarea {
    min-height: 120px;
    width: 100%;
    padding: 0.625rem;
    resize: vertical;
  }

  .sub-btn {
    display: block;
    width: 25%;
    padding: 0.75rem;
    background: var(--color-green);
    color: inherit;
    border-radius: 5px;
    cursor: pointer;
  }

  .sub-btn:hover {
      background: var(--color-med-aqua);
      color: var(--color-salmon);
  }