a.css

/*Note: titled the different sections of my code for
ease of use whilst coding & decided to leave it in. 
Hope it helps!*/

/*THE 101'S STYLING*/
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    overflow: auto;
}

/*LARGER BODY ELEMENT'S STYLING 
(the body's gen. +the header, the footer & what's in btwn em)*/
body {
    /*whitesmoke's less... eye-searing*/
    background-color: #30997421;
    font-family: 'DM Sans', sans-serif;

    /*in the case of vertical overflow, site clips the content
    and provides a scrolling mechanism (the scrollbar)*/
    overflow-y: scroll;
    /*in the case of horizontal overflow, site clips the content
    and doesn't provide a scrolling mechanism (the scrollbar)*/
    overflow-x: hidden;

    align-items: center;
    height: 100vh;

    margin: 0px;

    position: relative;
    box-sizing: border-box;

    /*NOTE TO SELF: no max. height bc there's also*/
    /*no max. number of items listed - can be as long as needed!!*/
    min-width: 500px;
    min-height: 100px;
}

body::after {
    content: '';
    display: block;
    /*set to be the same as footer's height*/
    height: 50px;
}

footer {
    position: relative;
    bottom: 0;
    /*adds space above the footer (so as to separate it)*/
    padding-top: 50px;
    width: 99%;
    height: 50px;
}

#header {
    padding-top: 40px;
    padding-bottom: 30px;
    text-align: center;
    /*darker than the others*/
    background: #0d554f;
    font-size: 30px;
}

/*can't put the same settings in body or header as the rest,
so I'm separating the code into two divs that can get
diffeent margins and paddings*/
#not_the_header {
    padding-top: 20px;
    padding-bottom: 30px;
    padding-left: 10px;
    padding-right: 10px;
    margin: 5px;
}

/*FORM STYLING*/
form {
    /*again, no max. height.*/
    min-height: 20vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/*ALL TEXT STYLING (headings, p, etc.)*/
#txtt {
    text-align: center;
    margin-top: 5px;
    margin-left: 5px;
    margin-right: 5px;
    margin-bottom: 0;
    /*keeps it from sliding left/right on resize*/
    position: relative;
    min-width: 500px;
    min-height: 20vh;
    padding-bottom: 0px;
}

h1 {
    text-align: center;
    color: whitesmoke;
    font-size: 35px;
    padding-top: 0px;
    padding-bottom: 17px;
}

h2 {
    text-align: center;
    color: black;
    padding: 15px;
    font-style: italic;
    font-size: 20px;
}

/*note to self: 
  this is the footer's font size*/
h3 {
    text-align: center;
    padding-bottom: 15px;
    padding-top: 45px;
    font-weight: lighter;
    font-size: 12px;
    color: #03332e;
}

p {
    text-align: center;
    padding-top: 28px;
    font-size: 12px;
    /*just a lil darker than the rest*/
    color: #022522;
}

/*alternate 'p' styling via id, 
the "Station: " text's setings*/
#shh {
    font-size: 15px;
    padding-top: 0px;
    padding-bottom: 5px;
    color: #03332e;
}

/*all placeholder text*/
::placeholder {
    /*lowers the opacity of the placeholder text*/
    opacity: 50%;
    /*only affect placeholder, not the items themselves*/
    font-style: italic;
}

/*CONTAINER DIV STYLING*/
/*the raw data container div*/
#train_station_raw {
    margin: auto;
    /*centers text field & button to the center of... the center.*/
    text-align: center;
    align-items: center;

    background-color: #309975;
    /*ALT: background-image: linear-gradient(#309975, #63a38d, #84b478, #9fbd97);*/

    /*box bg*/
    width: 50%;
    top: 50%;
    /*rounds the corners*/
    border-radius: 13px;

    padding: 30px;

    /*NOTE TO SELF: no max. height bc there's also*/
    /*no max. number of items listed - can be as long as needed!!*/
    min-width: 500px;
    min-height: 100px;
}

/*non-raw data container*/
#train_station {
    margin: auto;
    /*centers text field & button to the center of... the center.*/
    text-align: center;
    align-items: center;

    background-color: #309975;
    /*ALT: background-image: linear-gradient(#309975, #63a38d, #84b478, #9fbd97);*/

    /*box bg*/
    width: 50%;
    top: 50%;
    /*rounds the corners*/
    border-radius: 13px;

    padding: 30px;
    margin-bottom: 50px;

    /*NOTE TO SELF: no max. height bc there's also*/
    /*no max. number of items listed - can be as long as needed!!*/
    min-width: 500px;
    min-height: 100px;
}

/*BUTTON STYLING*/
#submit_btn {
    cursor: pointer;
    padding: 20px;
    background-color: white;
    color: #309975;
    /*not as jarring*/
    transition: all 0.4s ease;
    text-align: center;
    /*gets rid of the button's border & outline*/
    outline: none;
    border: none;
}

#submit_btn:hover {
    cursor: pointer;
    /*black w muted transparency settings to 
    get a better matched darker green*/
    background-color: rgba(0, 0, 0, 0.432);
    color: white;
}

/*INPUT STYLING*/
#station {
    /*default font of the textarea (to match 2nd container)*/
    font-family: monospace;
}

input {
    cursor: pointer;
    padding: 20px;
    /*removes the border & outline of the input area*/
    outline: none;
    border: none;
    width: 100%;
}

input:focus {
    /*removes the border & outline when*/
    /*user clicks on "add new item"*/
    outline: none;
    border: none;
}

select {
    cursor: pointer;
    background-color: white;
    color: gainsboro;
    width: 90px;
    padding: 15px;
    border-radius: 13px;
    padding: 3px;
    border: none;
    outline: none;
}

/*TEXT AREA'S STYLING*/
#traindata {
    /*only raw data has The Programmer Font,
    whereas the "normal" results have the same font family*/
    font-family: 'DM Sans', sans-serif;
    width: 100%;
    display: block;
    /*better readability :-)*/
    padding: 20px;
    /*gets rid of the grabber in the bottom right corner*/
    resize: none;
    /*removing outline*/
    outline: none;
    overflow: auto;
}

/*an actual text area doesn't work w <pre>, so.*/
#txtarea {
    background-color: white;
    color: black;
    padding-bottom: 20px;
    margin-bottom: 10px;
} 

textarea {
    background-color: white;
    /*code is green now :-)*/
    color: #08423d;
    width: 100%;
    display: block;
    /*better readability*/
    padding: 20px;
    /*gets rid of the grabber in the bottom right corner*/
    resize: none;
    /*removing outline*/
    outline: none;
    overflow: auto;
}

textarea:focus {
    /*removes the text area's border & outline when clicked*/
    /*which is esp. good since you can't actually do anything 
    in the text area, so the border would just be confusing!*/
    outline: none;
    border: none;
}

/*LINK STYLING*/
a:link {
    color: #03332e;
}

/*link changes color to green when hovered over*/
a:hover {
    color: #309975;
    transition: all 0.3s ease;
}

/*THE SCROLLBAR'S STYLING*/
::-webkit-scrollbar {
    /*scrollbar's width*/
    width: 15px;
}

::-webkit-scrollbar-track {
    /*scrollbar's bg colors*/
    background: #f1f1f1;
    /*makes the scrollbar bg rounder as well*/
    box-shadow: inset 0 0 3px rgba(0,0,0,0.3); 
    -webkit-border-radius: 13px;
    border-radius: 13px;
}

::-webkit-scrollbar-thumb {
    /*scrollbar's color*/
    background: darkgray;
    /*makes the scrollbar rounder at its corners*/
    border-radius: 13px;
    -webkit-border-radius: 13px;
    /*adds a shadow to the edges of the scrollbar,
    improves visibility*/
    box-shadow: inset 0 0 3px rgba(0,0,0,0.5); 
}

/*scrollbar on hover*/
::-webkit-scrollbar-thumb:hover {
    /*scrollbar's secondary color 
    (active on hover)*/
    background: rgba(0, 0, 0, 0.808);
}

/*when site is inactive - i.e. when user's mouse is not
on the page, the scrollbar changes color*/
::-webkit-scrollbar-thumb:window-inactive {
	background: lightgray; 
}