body {
 background-color: lightblue;
   display: grid;
   place-items: center; 
}

#content {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50%;
  max-width:1100px;
  min-width: 1100px;
  padding: 2px;
   box-sizing: border-box;
}

#mass-holder {
 box-sizing: border-box;
 width: 100%;
 background-color: pink;
 min-height: 900px;
 border: 2px inset;
 border-color: #FF4D70;;
 border-radius:15px;
 overflow: hidden; 
}

.columnflex {
 display: flex;
 flex-direction: column;
 align-items: center;

}