/* * {border: 1px solid red;} */

:root {
  --background-colour: rgb(250, 250, 250);
}

body {
    margin: 0;
    padding: 0;
    width: 100%;
    background-color: var(--background-colour);
    line-height: 1.6;
}

.centre {
  margin: 0 auto;
  }

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

.centre-img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.navbar {
    position: sticky;
    z-index: 100;
    background-color: black;
    top: 0;
    width: 100%;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar a {
    float: left;
    display: block;
    position: relative;
    color: var(--background-colour);
    text-align: center;
    padding: 5px;
    margin: 12px 16px;
    text-decoration: none;
    font-size: 1rem;

  }

  .navbar a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0.1rem;
    background-color: var(--background-colour);
    transform: scale(0);
    transform-origin: center;
    transition: transform 300ms;

  }

  .navbar a:hover::after,
  .navbar a:focus::after{
    transform: scale(1);
  }