Using Bootstrap Components

Start

Befor you begin using Bootstrap components or copy-pasting on your projects, make sure you have included all the required files on header. Here are the code snippet you must include on header

<!--====== Bootstrap CSS ======-->
<link rel="stylesheet" href="assets/css/bootstrap.min.css" />

<!--====== Lineicons CSS as we are using this for icons ======-->
<link rel="stylesheet" href="assets/css/lineicons.css" />

<!--====== Starter Style CSS to make components works ======-->
<link rel="stylesheet" href="assets/css/starter.css" />

starter.css

You will have all these files included on the download pack, still here is the explaination of starter.css so, you will be able to create your own file too and understand better:

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@200;300;400;500;600;700;800;900&display=swap');
/*===========================
  COMMON css 
===========================*/
:root {
  --font-family: 'Inter', sans-serif;
  --primary: #155bd5;
  --primary-dark: #1c3ab6;
  --primary-light: #e2f1ff;
  --accent: #00d4d7;
  --accent-dark: #00bac1;
  --accent-light: #dff9f8;
  --success: #13d527;
  --success-dark: #00ae11;
  --success-light: #eafbe7;
  --secondary: #8f15d5;
  --secondary-dark: #6013c7;
  --secondary-light: #f4e5fa;
  --info: #15b2d5;
  --info-dark: #0f8ca8;
  --info-light: #e0f5fa;
  --caution: #dbbb25;
  --caution-dark: #d58f15;
  --caution-light: #fbf9e4;
  --error: #e6185e;
  --error-dark: #bf1257;
  --error-light: #fce4eb;
  --black: #1d1d1d;
  --dark-1: #2d2d2d;
  --dark-2: #4d4d4d;
  --dark-3: #6d6d6d;
  --gray-1: #8d8d8d;
  --gray-2: #adadad;
  --gray-3: #cdcdcd;
  --gray-4: #e0e0e0;
  --light-1: #efefef;
  --light-2: #f5f5f5;
  --light-3: #fafafa;
  --white: #ffffff;
  --gradient-1: linear-gradient(180deg, #155bd5 0%, #1c3ab6 100%);
  --gradient-2: linear-gradient(180deg, #155bd5 13.02%, #00d4d7 85.42%);
  --gradient-3: linear-gradient(180deg, #155bd5 0%, #8f15d5 100%);
  --gradient-4: linear-gradient(180deg, #155bd5 0%, #13d527 100%);
  --gradient-5: linear-gradient(180deg, #155bd5 0%, #15bbd5 100%);
  --gradient-6: linear-gradient(180deg, #155bd5 0%, #dbbb25 100%);
  --gradient-7: linear-gradient(180deg, #155bd5 0%, #e6185e 100%);
  --gradient-8: linear-gradient(180deg, #1c3ab6 0%, #00bac1 100%);
  --gradient-9: linear-gradient(180deg, #00d4d7 13.02%, #155bd5 85.42%);
  --shadow-1: 0px 0px 1px rgba(40, 41, 61, 0.08), 0px 0.5px 2px rgba(96, 97, 112, 0.16);
  --shadow-2: 0px 0px 1px rgba(40, 41, 61, 0.04), 0px 2px 4px rgba(96, 97, 112, 0.16);
  --shadow-3: 0px 0px 2px rgba(40, 41, 61, 0.04), 0px 4px 8px rgba(96, 97, 112, 0.16);
  --shadow-4: 0px 2px 4px rgba(40, 41, 61, 0.04), 0px 8px 16px rgba(96, 97, 112, 0.16);
  --shadow-5: 0px 2px 8px rgba(40, 41, 61, 0.04), 0px 16px 24px rgba(96, 97, 112, 0.16);
  --shadow-6: 0px 2px 8px rgba(40, 41, 61, 0.08), 0px 20px 32px rgba(96, 97, 112, 0.24);
}

body {
  font-family: var(--font-family);
  color: var(--black);
  font-size: 16px;
}
@media (max-width: 991px) {
  body {
    font-size: 14px;
  }
}

img {
  max-width: 100%;
}

a {
  display: inline-block;
}

a,
button,
a:hover,
a:focus,
input:focus,
textarea:focus,
button:focus {
  text-decoration: none;
  outline: none;
}

ul,
ol {
  margin: 0px;
  padding: 0px;
  list-style-type: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  color: var(--black);
  margin: 0px;
}

h1,
.h1 {
  font-size: 2.75em;
  line-height: 1.25;
}

h2,
.h2 {
  font-size: 2.25em;
  line-height: 1.25;
}

h3,
.h3 {
  font-size: 1.75em;
  line-height: 1.25;
}

h4,
.h4 {
  font-size: 1.5em;
  line-height: 1.25;
}

h5,
.h5 {
  font-size: 1.25em;
  line-height: 1.25;
}

h6,
.h6 {
  font-size: 0.875em;
  line-height: 1.25;
}

.display-1 {
  font-size: 5.5em;
  line-height: 1.25;
}

.display-2 {
  font-size: 4.75em;
  line-height: 1.25;
}

.display-3 {
  font-size: 4em;
  line-height: 1.25;
}

.display-4 {
  font-size: 3.25em;
  line-height: 1.25;
}

p {
  font-size: 1em;
  font-weight: 400;
  line-height: 1.5;
  color: var(--dark-3);
  margin: 0px;
}

.text-small {
  font-size: 0.875em;
  line-height: 1.5;
}

.text-lg {
  font-size: 1.15em;
  line-height: 1.5;
}

.bg_cover {
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

@media (max-width: 767px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }
}

.btn {
  font-weight: bold;
  font-size: 16px;
  line-height: 20px;
  text-align: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 12px 24px;
  border-radius: 4px;
  border: 1px solid transparent;
}
.btn:hover {
  color: inherit;
}
.btn:focus {
  box-shadow: none;
  outline: none;
}
.btn.btn-lg {
  font-size: 1.15em;
  padding: 16px 24px;
}
.btn.btn-sm {
  padding: 8px 16px;
}
.btn.square {
  border-radius: 0px;
}
.btn.semi-rounded {
  border-radius: 12px;
}
.btn.rounded-full {
  border-radius: 50px;
}
.btn.icon-left span,
.btn.icon-left i {
  margin-right: 8px;
}
.btn.icon-right span,
.btn.icon-right i {
  margin-left: 8px;
}
.btn.icon-btn {
  width: 48px;
  height: 48px;
  padding: 0;
  line-height: 48px;
}
.btn.icon-btn.btn-lg {
  width: 56px;
  height: 56px;
  line-height: 56px;
}
.btn.icon-btn.btn-sm {
  width: 40px;
  height: 40px;
  line-height: 40px;
}