Html – Huge gap at the bottom of the webiste

Here is my website: https://enmasantos.github.io/vitality_vista, for a personal project I am making, on below the footer there is a huge white space. And I have checked margin both for the footer and surrounding elements.
Here is the code I am using for the footer:

/* footer.css */

.footer {
    color: #ffffff;
    padding: 1.5rem 0;
    text-align: center;
    transition: background-color 0.3s ease; /* Smooth transition for dynamic color change */
    height: 16%;
    border: 15px solid red;
}

.social-icons a img {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease, fill 0.3s ease; /* Smooth color and scale transition */
}

.social-icons a img:hover {
    transform: scale(1.1);
}

.footer-bottom p {
    font-size: 0.875rem;
    margin: 0;
    color: #f1f1f1;
}

here are my general style, but don’t know if they have any relationship with what’s going on:

/* global.css */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
/* Root Variables for Color Palette and Fonts */
:root {
  --fandango: #a4036f;
  --bittersweet: #ff595e;
  --sunglow: #ffca3a;
  --yellow-green: #8ac926;
  --steel-blue: #1982c4;
  --text-color: #333;
  --background-color: #f9f9f9;
  --font-family: 'Arial', sans-serif;
  --font-size-base: 16px;
}

/* General Reset */
body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-color);
  background-color: var(--background-color);
  line-height: 1.6;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--fandango);
  margin-bottom: 0.5em;
  font-weight: bold;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.5rem;
}

/* Paragraphs */
p {
  
  color: var(--text-color);
}

/* Links */
a {
  color: var(--steel-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Buttons */
button {
  font-family: var(--font-family);
  padding: 10px 20px;
  border-radius: 5px;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  opacity: 0.9;
}

/* Container Layout */
.container {
  width: 90%;
  max-width: 100%;
  margin: 0 auto;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 1rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

/* Dashboard Container */
.dashboard-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); /* Responsive card size */
  gap: 1.25rem;
  padding: 2rem;
}

/* Card Styles */
.dashboard-card {
  background-color: #ffffff;
  padding: 1rem;
  border-radius: 0.625rem;
  box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

.dashboard-card:hover {
  transform: translateY(-0.3125rem);
}

.dashboard-card h3 {
  color: var(--fandango);
  font-size: 1.2rem;
  margin-bottom: 0.625rem;
}

.dashboard-card p {
  color: #333;
  margin-bottom: 0.625rem;
  font-size: 1rem;
}

.dashboard-card button {
  padding: 0.625rem 1.25rem; /* Spacing is now based on rem */
  border: none;
  border-radius: 0.3125rem;
  background-color: var(--bittersweet);
  color: #ffffff;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s ease;
}

.dashboard-card button:hover {
  background-color: var(--sunglow);
}

body, main {
  overflow-x: hidden;
}