<div class="board">
  <h1>Please, stand by, we are working on something cool.</h1>
</div>
:root {
  --primary-color: #ffee00;
  --secondary-color: #242424;
  --deg: 5deg;
}

html {
  font-size: 100%;
}

body {
  margin: 0;
}

body::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 20px;
  z-index: 10;
  background-image: repeating-linear-gradient(-45deg,
    var(--primary-color),
    var(--primary-color) 50px,
    var(--secondary-color) 50px,
    var(--secondary-color) 100px);
}

.board {
  font-size: 1.5rem;
  padding: 0.5em 1.5em;
  background: #f0f0f0;
  border: 1px solid #e9e9e9;
  border-radius: 10px;
  box-shadow: -6px 16px 24px rgba(0,0,0,0.08);
  color: black;
  font-family: 'Helvetica Neue', Arial, sans-serif;
  position: absolute;
  top: 50%;
  left: 50%;
  text-align: center;
  transform: translate(-50%, -50%) rotate(calc(-1 * var(--deg)));
  width: 75%;
}

@media screen and (min-width: 480px) {
  .board {
    font-size: 2rem;
  }
}

@media screen and (min-width: 720px) {
  .board {
    font-size: 2.5rem;
    width: 62.5%;
  }
}

@media screen and (min-width: 960px) {
  .board {
    font-size: 3rem;
    width: 50%;
  }
}

@media screen and (min-width: 1280px) {
  .board {
    width: auto;
  }
}

.board::before {
  content: '';
  position: absolute;
  top: -50vh;
  height: 50vh;
  display: block;
  left: 30px;
  right: 30px;
  transform: skew(calc(-1 * var(--deg)));
  border: dotted var(--secondary-color);
  border-width: 0 8px;
  transform-origin: bottom left;
  padding-bottom: 30px;
}

.board h1 {
  margin: 0;
  font-size: inherit;
}

.board h1::before,
.board h1::after {
  content: '';
  position: absolute;
  top: 16px;
  width: 20px;
  height: 20px;
  background-color: #fff;
  border-radius: 50%;
  box-shadow: inset 2px 2px 2px rgba(0, 0, 0, 0.4);
  z-index: -1;
}

.board h1:before {
  left: 24px;
}

.board h1:after {
  right: 24px;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

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