style.css

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

/* Code start here */
body{
    font-family: 'Dancing Script', cursive;
    background-color: #d3d3d3;
    height: 100vh;
}

form{
    font-size:60px;
    font-weight: 800;
    text-align: center;
    background: linear-gradient(90deg, #f074e5, #a5abf5);
    padding:20px 0;
}

#taskbar{
    width:45%;
    height:25px;
}

#add{
    width:31px;
    height:31px;
    transform: translate(-10px);
}

div{
    background-color: #d3d3d3;
    display: inline-flex;
    width:100vw;
}

li{
    font-size:25px;
    text-align:left;
    background-color: #a0a0a0;
    width:90%;
    padding: 5px 10px 5px 20px;
    margin: 0.15em 0 0.15em 15px;
    border: 1px solid #3d3c3c;
}


.done-btn{
    color: white;
    background-color: #15c440;
    border: none;
    width: 2.7em;
    height: 2.8em;
    transform:translate(5px,10%);
    margin-right: 5px;
}

.del-btn{
    color: white;
    background-color: #eb2e27;
    border: none;
    width: 2.7em;
    height: 2.8em;
    transform:translate(5px,10%);
    margin-right: 10px;
}

.done{
    text-decoration: line-through;
    background-color: #8cdac0;
}

#add:hover, .done-btn:hover, .del-btn:hover{
    cursor: pointer;
}