html,body{ margin: 0;}

.div_contenedor{
    background: rgb(255, 255, 255);
    height: 100vh;       
}

.div_centrado{
    background: rgb(255, 255, 255);
    width: 1200px;       
    height: 700px;
    position: absolute;
    left: 50%;           
    margin-top: 100px;
    margin-left: -800px;
}

table { 
  border-collapse: collapse; 
}

td{
  padding-top: 40px;
  padding-left: 20px;
}

input{
  width: 150px;
  height: 90px;
  text-align: center;
  font-size: 50px;
  margin-top: 10px;
}

.botoiak{
  margin-top: 80px;
  background-color: brown;
  text-align: center;
}

ul{
    display: inline-flex;
    flex-direction: row;
    list-style: none;
}

button{
  width: 150px;
  height: 150px;
  font-size: 80px;
  cursor: pointer;
}

button:hover{
  background-color: black;
  color: aliceblue;
}

li{
  margin: 40px;
}