* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.btn-container {
  padding: 5px 7px;
}
.btn {
  border: none;
  outline: none;
  background: #409eff;
  color: #fff;
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  text-align: center;
  transition: 0.1s;
  font-weight: 500;
  user-select: none;
  padding: 12px 20px;
  font-size: 14px;
  border-radius: 4px;
  display: block;
  margin: 2em auto;
}
.btn:hover {
  background: #66b1ff;
}
.btn:active {
  background: #3a8ee6;
}
.btn:disabled {
  background: #66b1ff80;
  cursor: not-allowed;
}
.btn-container {
  filter: url(#noise);
}