body {
background: #f1dbb2;
background-image: url(https://pazlyonline.com/igry_golovolomki/igra_truboprovod/bg-img.jpg);
}
.trbutton {
padding: 7px 0 7px 0;
margin-top: 7px;
margin-bottom: 7px;
text-align: center;
}