body {
    background-color: var(--color_two);
}

.btn {
    background-color: var(--color_three);
    color: var(--font_color_one);
}

.font_color2 {
    color: var(--color_one);
    font-weight: bold;
}

.font_color3 {
    color: var(--color_three);
}

.fs_4 {
    font-size: 4em;
    font-weight: bold;
    color: var(--color_one);
}

.flex_box {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex_colmn {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

header {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

nav {
    background-color: var(--color_one);
    color: var(--font_color_one);
    font-size: 20px;
}

.nav_box {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    white-space: normal;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 99;
}

.navbar-collapse {
    flex-grow: 0;
}

.link {
    color: var(--font_color_one);
    display: inline-block;
    transition: all 500ms;
    position: relative;
}

.link::after {
    content: "";
    bottom: 3px;
    height: 2px;
    background-color: var(--font_color_one);
    width: 95%;
    position: absolute;
    left: 50%;
    transition: all 500ms;
    transform: translateX(-50%) scaleX(0);
}

.link:hover {
    color: var(--color_two);
}

.link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.header_section {
    color: var(--color_one);
}

.main_box {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.item {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;

}

.card-body {
    flex: 0;
}

@media (max-width:1200px) {
    .nav_box {
        width: 100%;
    }
}