/* Variables */
:root
{
    --primary-color: #425b84;
    --secondary-color: #5b7bb4;
    --max-width: 1100px;
}

/* Reset CSS */

*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body
{
    font: normal 1rem/1.5 'Arial', sans-sarif;
    background: var(--primary-color);
    color: #fff;
    overflow-x: hidden;
    padding-bottom: 50px;
}

#main-header
{
    background: var(--secondary-color);
    padding: 4rem 0;
}

.container
{
    max-width: var(--max-width);
    margin: 0 auto;
    text-align:center;
}

h1
{
    font-size: 2.3rem;
}

#timeline ul
{
    background: var(--primary-color);
    padding: 50px;
}

/* Creating a Line */

#timeline ul li
{
    list-style: none;
    position: relative;
    width: 6px;
    margin: 0 auto;
    padding-top: 50px;
    background: #fff;
}

/* Box */

#timeline ul li div
{
    position: relative;
    bottom: 0;
    width: 400px;
    padding: 1rem;
    background: var(--secondary-color);
    transition: all 0.5s ease-in-out;
    visibility: hidden;
    opacity: 0;
}

/* Right side using nth child */

#timeline ul li:nth-child(odd) div
{
    left: 40px;
    transform: translate(200px, 0);
} 

/* left side using nth child */

#timeline ul li:nth-child(even) div
{
    left: -434px;
    transform: translate(-200px, 0); 
}

/* Right side using nth child */

#timeline ul li:nth-child(odd) div
{
    left: 40px;
}

/* Dots */

#timeline ul li:after
{
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 25px;
    height: 25px;
    background: var(--secondary-color);
    border-radius: 50%;
    transform: translateX(-50%);
    transition: background 0.5s ease-in-out;
}

/* Arrow base */

#timeline div:before
{
    content: '';
    position: absolute;
    bottom: 5px;
    width: 0;
    height: 0;
    border-style: solid;
}

/* Right side arrows */

#timeline ul li:nth-child(odd) div:before
{
    left: -15px;
    border-width: 8px 16px 8px 0;
    border-color: transparent var(--secondary-color) transparent transparent;

}

#timeline ul li:nth-child(even) div:before
{
    right: -15px;
    border-width: 8px 0 8px 16px;
    border-color: transparent transparent transparent var(--secondary-color);
}

/* Show boxes */

#timeline ul li.show div
{
    transform: none;
    visibility: visible;
    opacity: 1;
}

/* Media Queries */


@media(max-width:900px)
{
    #timeline ul li div
    {
        width: 250px;
    }

    #timeline ul li:nth-child(even) div
    {
        left: -234px;
    }
}

@media(max-width:600px)
{   
    #timeline ul li
    {
         margin-left: 20px; /*with this shifted line to left for responsive */
    }
    #timeline ul li div
    {
        width: calc(100vw-90px);
    }
    #timeline ul li:nth-child(even) div
    {
        left: 40px;
    }
    #timeline ul li:nth-child(even) div:before
    {
        left: -15px;
        border-width: 8px 16px 8px 0;
        border-color: transparent var(--secondary-color) transparent transparent;
    }   
}