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

body {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    font-family: 'Roboto Mono', monospace;
}

main {
    width: 700px;
    height: 100vmax;
    margin: 0 auto;
    margin-top: 100px;
    font-size : 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

h1 {
    font-size: 2rem;
    font-weight: 200;
    margin-bottom: 700px;
    mix-blend-mode: difference;
    background-color: black;
    color: white;
}

header {
    z-index: 999;
}

a { 
    color: black;
}

p {
    margin: 0 auto;
    font-size: 2rem;
    line-height: 4rem;
    margin-bottom: 25px;
}

.message {
    width: 700px;
}

.buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  position: sticky;
  top: 15px;
}

button {
  font-size: 1rem;
  padding: 0.6rem 1.2rem;
  border: 2px solid black;
  background: transparent;
  border-radius: 9999px;
  transition: transform 0.2s ease;
}

button:hover {
  transform: scale(1.1);
}

.layer {
  transition: color 0.6s ease;
}

#circle-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: transparent;
  z-index: 0;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.img-container {
    margin: 0 auto;
    height: 400px;
    position: fixed;
    top: 25px;
    z-index: -1;
}

img {
    width: 100vw;
}

.filter-btn {
    width: 100px;
}
.filter-btn:hover {
    cursor: pointer;
}

#filter-btn-white {
    background-color: white;
}
#filter-btn-orange {
    background-color: orangered;
}
#filter-btn-violet {
    background-color: violet;
}
#filter-btn-green {
    background-color: lime;
}