:root {
    --color-white : #FFF;
    --color-black : #000;
    --color-yellow : #FFBE2B;
    --color-gray : #384552;
    --color-blue : #0000FF;
}

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;
}

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;
}

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

html {
    font-size: 62.5%;
}

body {
    position: relative;

    background: var(--color-blue);
    background: linear-gradient(320deg, rgba(0,26,157,1) 0%, rgba(2,41,238,1) 100%);

    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 1.6rem;
    line-height: 1.3;
    color: var(--color-white);
}

html, body {
    height: 100vh;
}

a {
    display: inline-block;
    color: var(--color-white);
}

a:focus {
    outline: 0.4rem solid var(--color-white);
    outline-offset: 0.4rem; 
}

h1 {
    font-size: 2rem;
}

.start-container {
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;

    height: 100%;
}

.start-header {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    padding: 2rem 0rem 0rem;
}

.start-header a {
    display: block;
    width: 15rem;

    border: 0.4rem solid var(--color-white);
    border-radius: 100%;
}

.start-header img {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
}

.start-main {
    margin-top: 6rem;
}

.start-main h1 {
    margin-top: 4rem;
    margin-bottom: 4rem;
    text-align: center;
    font-weight: bold;
}

.start-footer {
    margin-top: auto;
    padding: 2rem;
    font-size: 1.2rem;
    text-align: center;
}

.tool-list {
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
    width: 100rem;
}

.tool-list li {
    width: 50%;
    border: 1rem solid transparent;
}

.tool-list a {
    display: block;
    padding: 4rem 2rem;
    background-color: var(--color-white);
    text-align: center;
    color: var(--color-blue);
    text-decoration: none;
}

.tool-list a:hover, 
.tool-list a:focus {
    text-decoration: underline;
}