body {
  background-image: url("https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSMjsq_11bqXgjjAf3pFPn05tiqAJxKAUwOzw&usqp=CAU");
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed; 
  margin: 0;  
  margin-bottom: 100px;
}
 
h2,  .timer_message,
#timer1, #timer2, #timer3,
#timer4, #timer5, #timer6,
#timer7, #timer8, 
.review-schedule,
.universe,p, button,
button a:link,
a:visited {
  font-family: avenir-light;  
  color: white;  
}

a, h2, .timer_message,
#timer1, #timer2, #timer3,
#timer4, #timer5, #timer6,
#timer7, #timer8, 
.review-schedule,
.universe, p, button {
  text-align: center;
}

h2, .timer_message,
#timer1, #timer2, #timer3,
#timer4, #timer5, #timer6,
#timer7, #timer8,
.review-schedule,
.universe {
  text-shadow: 0px 2px 5px red;  
}

button {
  background-color: red;
}

h2 {
  font-size: 50pt;
  margin: 32px 0 64px 0;
}

h2.timer_message {
  font-size: 30pt;
  margin: 0 32px auto;
}

#timer1, #timer2, #timer3,
#timer4, #timer5, #timer6,
#timer7, #timer8 {
  font-size: 25pt;
  margin: 16px 64px auto;
  margin-bottom: 64px;
  text-align: center;
  font-weight: 700;
}

.review-schedule,
.universe {
  font-size: 25pt;
  border: none; 
  border-radius: 10px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-content: center;
  text-align: center;
  margin-bottom: 32px;   
  box-shadow: 0px 2px 5px red;
}

a:hover, a:active {
  text-decoration: underline;
}