app.css

* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
}

/* ---------- HEADER SECTION ------------ */

/* This is the header container configurations */
.header {
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(4, 9, 30, 0.7), rgba(4, 9, 30, 0.7)), url(images/header.jpg);
    background-position: center;
    background-size: cover;
    position: relative;
}

/* This is the nav container where it contains the images and nav links */
nav {
    display: flex;
    padding: 2% 6%;
    justify-content: space-between;
    align-items: center;
}

/* Both of the images sa nav section will have a width of 150px only */
nav img {
    width: 150px;
}

/* Papabilugin niya ang profile picture ko */
nav #profile_picture {
    border-radius: 50%;
    margin-left: 38px;
}

/* This will affect the container for all the links */
.nav-links {
    flex: 1;
    text-align: right;

}

/* This will affect the links under the li */
.nav-links ul li {
    list-style: none;
    display: inline-block;
    padding: 8px 12px;
    position: relative;
}

/* This will affect the anchor tags or the links specifically */
.nav-links ul li a {
    color: white;
    text-decoration: none;
    font-size: 13px;
}

/* Animation design for the links in the nav */
/* I don't know how this works */
.nav-links ul li::after {
    content: '';
    width: 0%;
    height: 2px;
    background: #f44336;
    display: block;
    margin: auto;
    transition: 0.5s;
}

.nav-links ul li:hover::after {
    width: 100%;
}

nav .fa {
    display: none;
}

/* This is for the textbox inside the header */
/* I need to draw the effects of the units in the notebook so I can better visualize what's happening with those units */
.text-box {
    width: 90%;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.text-box h1 {
    font-size: 62px;
}

.text-box p {
    margin: 10px 0 40px;
    font-size: 23px;
    color: white;
}

/* This class selector is VERY IMPORTANT as it affects all classes with .row to fix the images. */

.row {
    margin-top: 5%;
    display: flex;
    justify-content: space-evenly;
}

/* -------------- PRELIM ACTIVITIES SECTION ---------- */


.prelim {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

.prelim-col {
    flex-basis: 31%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: left;
}

.prelim-col iframe {
    width: 100%;
    transition: 0.5s;
}

.prelim-col iframe:hover {
    /* transform: scale(1.5) translate(0, -10ex); */
    box-shadow: -1px 1px 8px 6px rgba(6, 7, 7, 0.62);
    -webkit-box-shadow: -1px 1px 8px 6px rgba(10, 12, 14, 0.62);
    -moz-box-shadow: -1px 1px 8px 6px rgba(8, 10, 10, 0.62);
}

.prelim-col p {
    padding: 0;
}

.prelim-col h3 {
    margin-top: 16px;
    margin-bottom: 15px;
    text-align: left;
}

/* ------------ MIDTERM ACTIVITIES SECTION ------------- */

.midterm {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

.midterm-col {
    flex-basis: 31%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: left;
}

.midterm-col iframe {
    width: 100%;
    transition: 0.5s;
}

.midterm-col iframe:hover {
    /* transform: scale(1.5) translate(0, -10ex); */
    box-shadow: -1px 1px 8px 6px rgba(6, 7, 7, 0.62);
    -webkit-box-shadow: -1px 1px 8px 6px rgba(10, 12, 14, 0.62);
    -moz-box-shadow: -1px 1px 8px 6px rgba(8, 10, 10, 0.62);
}

.midterm-col p {
    padding: 0;
}

.midterm-col h3 {
    margin-top: 16px;
    margin-bottom: 15px;
    text-align: left;
}

/* ------- OTHER ACTIVITIES SECTION --------- */

.other {
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;
}

.other-col {
    flex-basis: 31%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: left;
}

.other-col iframe {
    width: 100%;
    transition: 0.5s;
}

.other-col iframe:hover {
    /* transform: scale(1.5) translate(0, -10ex); */
    box-shadow: -1px 1px 8px 6px rgba(6, 7, 7, 0.62);
    -webkit-box-shadow: -1px 1px 8px 6px rgba(10, 12, 14, 0.62);
    -moz-box-shadow: -1px 1px 8px 6px rgba(8, 10, 10, 0.62);
}

.other-col p {
    padding: 0;
}

.other-col h3 {
    margin-top: 16px;
    margin-bottom: 15px;
    text-align: left;
}

/* -------- TESTIMONIAL SECTION -------- */

.testimonial {
    width: 80%;
    margin: auto;
    padding-top: 100px;
    text-align: center;
}

.testimonial-col {
    flex-basis: 44%;
    border-radius: 10px;
    margin-bottom: 5%;
    text-align: left;
    background: #fff3f3;
    padding: 25px;
    cursor: pointer;
    display: flex;
}

.testimonial-col img {
    height: 40px;
    margin-left: 5px;
    margin-right: 30px;
    border-radius: 50%;
}

.testimonial-col p {
    padding: 0;
}

.testimonial-col h3 {
    margin-top: 15px;
    text-align: left;
}

.testimonial-col .fa {
    color: #f44336
}

/* -------- WHAT IS DMATH SECTION ---------------- */

.dmath {
    margin: 100px auto;
    width: 80%;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url(images/spcf_front.jpg);
    background-position: top;
    background-size: cover;
    border-radius: 10px;
    text-align: center;
    padding: 100px 0;
}

.dmath h1 {
    color: white;
    margin-bottom: 40px;
    padding: 65px;
}

/* -------- FOOTER/ABOUT ME SECTION ------- */

.footer {
    width: 100%;
    text-align: center;
    padding: 30px 0;
}

.footer h4 {
    margin-bottom: 25px;
    margin-top: 20px;
    font-weight: 600;
}

.icons .fa {
    color: #f44336;
    margin: 0 13px;
    cursor: pointer;
    padding: 18px 0;
}

/* ---------- SOME ANIMATION FOR NAVLINKS ------- */