* {
  box-sizing: border-box;
}

    /* Column container */
    .row {  
      display: flex;
      flex-wrap: wrap;
      margin-left: 5%;
      margin-right: 5%;    
      margin-top: 5%;  
      margin-bottom: 5%;
    }
    
    /* Create two unequal columns that sits next to each other */
    /* Sidebar/left column */
    .side {
      flex: 20%;
      background-color: black;
      padding: 20px;
    }
    
    /* Main column */
    .main {
      flex: 80%;
      background-color: black;
      padding: 20px;
    }

/* Responsive layout - when the screen is less than 700px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 700px) {
  .row {   
    flex-direction: column;
  }
}    


.Selectores{
        display: block;
        margin-top: 20px; 
        background-color: black;
        width: 100%;
        border-left-width: 0px;
        border-right-width: 0px;
      }