style.css

@import url('https://fonts.googleapis.com/css2?family=Nanum+Gothic&&family=Montserrat:wght@300&display=swap');

html {
  /* 
    whenever you add padding to an element, what could happen is
    the element might stretch the page. 
    Say you had a page that was 100 percent of the view ports width, 
    if padding is added, it would extend beyong 100 percent, which adds a
    horizontal scroll bar. 
    This prevents padding to add extra width/height to the page. 
    */
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: rgb(37, 37, 37);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 304 304' width='304' height='304'%3E%3Cpath fill='%23a8a7a9' fill-opacity='0.4' d='M44.1 224a5 5 0 1 1 0 2H0v-2h44.1zm160 48a5 5 0 1 1 0 2H82v-2h122.1zm57.8-46a5 5 0 1 1 0-2H304v2h-42.1zm0 16a5 5 0 1 1 0-2H304v2h-42.1zm6.2-114a5 5 0 1 1 0 2h-86.2a5 5 0 1 1 0-2h86.2zm-256-48a5 5 0 1 1 0 2H0v-2h12.1zm185.8 34a5 5 0 1 1 0-2h86.2a5 5 0 1 1 0 2h-86.2zM258 12.1a5 5 0 1 1-2 0V0h2v12.1zm-64 208a5 5 0 1 1-2 0v-54.2a5 5 0 1 1 2 0v54.2zm48-198.2V80h62v2h-64V21.9a5 5 0 1 1 2 0zm16 16V64h46v2h-48V37.9a5 5 0 1 1 2 0zm-128 96V208h16v12.1a5 5 0 1 1-2 0V210h-16v-76.1a5 5 0 1 1 2 0zm-5.9-21.9a5 5 0 1 1 0 2H114v48H85.9a5 5 0 1 1 0-2H112v-48h12.1zm-6.2 130a5 5 0 1 1 0-2H176v-74.1a5 5 0 1 1 2 0V242h-60.1zm-16-64a5 5 0 1 1 0-2H114v48h10.1a5 5 0 1 1 0 2H112v-48h-10.1zM66 284.1a5 5 0 1 1-2 0V274H50v30h-2v-32h18v12.1zM236.1 176a5 5 0 1 1 0 2H226v94h48v32h-2v-30h-48v-98h12.1zm25.8-30a5 5 0 1 1 0-2H274v44.1a5 5 0 1 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}

.content {
  margin: 0;
  /* 
    vh stands for viewport height.
    And that is the full height of the entire window you are in. 
    We want to always stretch our background at least the full height 
    of the screen, even though the content isn't enough to 
    take up the full height of the screen. 
    */
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#reselect {
  font-size: 15px;
}

button {
  cursor: pointer;
  font-family: 'Nanum Gothic', sans-serif;
  font-size: 25px;
  color: white;
  width: 125px;
  height: 60px;
  text-shadow: 0 2px 5px black;
  /* background: linear-gradient(to top, #696969, #575757); */
  background: #000;
  border: 0.1em solid #fff;
  border-radius: 7px;
  box-shadow: inset 0 20px 4px -19px rgba(255, 255, 255, 0.4),
    0 12px 12px 0 rgba(0, 0, 0, 0.3);
  letter-spacing: 0.2rem;
  transition: all 0.2s;
  outline: none;
}

button:hover {
  color: #000;
  background-color: #fff;
}

button:active {
  transform: translateY(3px);
  box-shadow: 0 6px 6px 0 rgba(0, 0, 0, 0.3);
}

.disabled {
  pointer-events: none;
}

/* footer */

footer,
.push {
  text-align: center;
  height: 50px;
  font-family: 'Montserrat';
  font-size: 14px;
  color: white;
  text-shadow: 2px 2px 2px #000;
}

a {
  color: inherit;
  text-decoration: none;
}