page.css

:root {
  --background-body: #fff;
  --background: #878787;
  --background-alt: #f7f7f7;
  --selection: #9e9e9e;
  --text-main: #121212;
  --text-muted: #878787;
  --primary: #3C2979;
  --secondary: #F6A000;
  --focus: #3C2979;
  --border: #3C2979;
  --code: #121212;
  --animation-duration: 0.35s;
  --button-hover: #878787;
  --scrollbar-thumb: rgb(213, 213, 213);
  --scrollbar-thumb-hover: rgb(196, 196, 196);
  --form-placeholder: #737373;
  --form-text: #121212;
  --variable: #39a33c;
  --highlight: #ff0;
}

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

*:hover {
  transition: all .25s ease;
}

html {
  scrollbar-color: rgb(213, 213, 213) #fff;
  scrollbar-color: var(--scrollbar-thumb) var(--background-body);
  scrollbar-width: thin;
  font-size: 16px;
}

body {
  font-family: Lato, Arial, 'Helvetica Neue', Helvetica, sans-serif;
  line-height: 1.5;
  font-size: 1rem;
  margin: 0 auto;
  word-wrap: break-word;
  color: #121212;
  color: var(--text-main);
  background: #fff;
  background: var(--background-body);
  text-rendering: optimizeLegibility;
}

button,
.btn {
  transition:
    background-color 0.1s linear,
    border-color 0.1s linear,
    color 0.1s linear,
    box-shadow 0.1s linear,
    transform 0.1s ease;
  transition:
    background-color var(--animation-duration) linear,
    border-color var(--animation-duration) linear,
    color var(--animation-duration) linear,
    box-shadow var(--animation-duration) linear,
    transform var(--animation-duration) ease;
}

input {
  transition:
    background-color 0.1s linear,
    border-color 0.1s linear,
    color 0.1s linear,
    box-shadow 0.1s linear,
    transform 0.1s ease;
  transition:
    background-color var(--animation-duration) linear,
    border-color var(--animation-duration) linear,
    color var(--animation-duration) linear,
    box-shadow var(--animation-duration) linear,
    transform var(--animation-duration) ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: Lato, Arial, 'Helvetica Neue', Helvetica, sans-serif;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

h1 {
  color: #000;
  color: var(--primary);
  font-size: 2rem;
}

h2 {
  color: #000;
  color: var(--primary);
  font-size: 1.25rem;
}

h3 {
  color: var(--secondary);
}

h4 {
  color: #000;
  color: var(--text-main);
}

h5 {
  color: #000;
  color: var(--text-main);
}

h6 {
  color: #000;
  color: var(--text-main);
}

p {
  margin-top: 0;
}

strong {
  color: #000;
  color: var(--text-main);
}

b,
strong,
th {
  font-weight: 700;
}

button,
select,
input[type='submit'],
input[type='button'],
input[type='checkbox'],
input[type='range'],
input[type='radio'] {
  cursor: pointer;
  margin: 0;
}

input:not([type='checkbox']):not([type='radio']),
select {
  display: block;
}

input {
  color: #000;
  color: var(--form-text);
  background-color: #fff;
  background-color: var(--background-body);
  font-family: inherit;
  font-size: inherit;
  padding: 10px;
  border: 1px solid var(--background);
  outline: none;
}

button {
  color: #000;
  color: var(--form-text);
  background-color: #fff;
  background-color: var(--background-body);
  border-radius: 0px;
  font-family: inherit;
  font-size: inherit;
  padding: 10px;
  border: 1px solid var(--background);
  outline: none;
}

input {
  vertical-align: top;
}

label {
  vertical-align: middle;
  font-size: 0.875rem;
  margin: 0;
  display: inline-block;
}

input:not([type='checkbox']):not([type='radio']),
input[type='range'],
select,
button,
textarea {
  -webkit-appearance: none;
}

button,
input[type='submit'],
input[type='button'] {
  padding-right: 30px;
  padding-left: 30px;
}

button:hover {
  background: #ddd;
  background: var(--button-hover);
}

input[type='submit']:hover {
  background: #ddd;
  background: var(--button-hover);
}

input[type='button']:hover {
  background: #ddd;
  background: var(--button-hover);
}

input:focus {
  box-shadow: 0 0 0 2px #0096bfab;
  box-shadow: 0 0 0 2px var(--focus);
}

select:focus {
  box-shadow: 0 0 0 2px #0096bfab;
  box-shadow: 0 0 0 2px var(--focus);
}

button:focus {
  box-shadow: 0 0 0 2px #0096bfab;
  box-shadow: 0 0 0 2px var(--focus);
}

textarea:focus {
  box-shadow: 0 0 0 2px #0096bfab;
  box-shadow: 0 0 0 2px var(--focus);
}

input[type='checkbox']:active,
input[type='radio']:active,
input[type='submit']:active,
input[type='button']:active,
input[type='range']:active,
button:active {
  transform: translateY(2px);
}

input:disabled,
select:disabled,
button:disabled,
textarea:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

::-moz-placeholder {
  color: #949494;
  color: var(--form-placeholder);
}

:-ms-input-placeholder {
  color: #949494;
  color: var(--form-placeholder);
}

::-ms-input-placeholder {
  color: #949494;
  color: var(--form-placeholder);
}

::placeholder {
  color: #949494;
  color: var(--form-placeholder);
}

a {
  text-decoration: none;
  color: #0076d1;
  color: var(--primary);
}

a:hover {
  text-decoration: none;
}

img,
video {
  max-width: 100%;
  height: auto;
}

hr {
  border: none;
  border-top: 1px solid #dbdbdb;
  border-top: 1px solid var(--border);
}

/* custom */

header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  padding: 1rem;
  font-size: 1rem;
}

.header-logo {
  display: block;
}

.header-lng-switch {
  color: var(--primary);
  cursor: pointer;
  font-weight: 700;
}

.header-lng-switch:hover {
  color: var(--secondary);
}

.header-lng-switch.active-lng {
  color: var(--secondary);
  text-decoration: underline;
}

footer {
  background: #6c757d;
  color: #fff;
  width: 100%;
  padding: 3rem 1rem;
}

.footer-row {
  display: flex;
  justify-content: center;
}

.footer-row a {
  display: block;
  color: #fff;
  margin: 0 1.25rem;
}

.footer-row a:hover img {
  opacity: 0.75;
}

#form-container {
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-block;
  font-size: 1rem;
  padding: 0.5rem 1rem;
}

.btn-primary {
  background: var(--primary);
  border: 1px solid var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--background-body);
  color: var(--primary);
}

.flex {
  display: flex;
}

.form-group {
  gap: 1rem;
  margin-bottom: 1rem;
}

.w-100 {
  width: 100%;
}

.control-group {
  align-items: center;
  margin-bottom: 0.5rem
}

.control-group > input {
  flex-shrink: 0;
}

.control-group > label {
  cursor: pointer;
  line-height: 1.25;
  margin-left: 0.75rem;
}

.footer-link {
  color: #878787;
}

.footer-link:hover {
  text-decoration: underline;
}

.form-overlay {
  align-items: center;
  background-color: rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  min-width: 100vw;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

.hover-underline:hover {
  text-decoration: underline;
}

.m-0 {
  margin: 0;
}

.mx-auto {
  margin: 0 auto;
}

.overlay-inner {
  align-items: center;
  background-color: #fff;
  box-shadow: 0 0.5rem 1rem rgb(0 0 0 / 10%);
  display: flex;
  flex-direction: column;
  justify-self: center;
  justify-content: center;
  margin: 2rem;
  padding: 1rem;
  width: calc(100% - 4rem);
  height: 300px;
  overflow-y: auto;
}

.site {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-content {
  flex-grow: 1;
  padding: 0 1rem;
  margin: 0 auto;
  margin-bottom: 2rem;
  width: 100%;
  max-width: 640px;
}

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

.text-primary {
  color: var(--primary)
}

.text-muted,
.text-muted:hover {
  color: var(--text-muted)
}

.text-sm {
  font-size: 0.75rem;
}

@media screen and (min-width: 640px) {  
  .overlay-inner {
    margin: 0 auto;
    padding: 2rem;
    width: 30%;
    height: 30%;
  }
}

.list-suggest {
  background: #f9f8fa;
  border: 1px solid var(--primary);
  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  list-style: none;
  margin: 0;
  margin-top: 1px;
  max-height: 250px;
  overflow-y: auto;
  padding: 0;
  position: absolute;
  top: 100%;
  transition: all .35s ease;
  width: 100%;
  z-index: 10;
}

.item-suggest {
  cursor: pointer;
  padding: 0.5rem 1rem;
  transition: all .35s ease;
}

.item-suggest:hover {
  background: #ccc;
}