.container {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  padding: 10px;
}

.blok {
  flex: 0 0 calc(25% - 12px);          /* ? 4 per rij (gap-correctie) */
  margin-bottom: 20px;
  border: 2px solid #2980B9;
  padding: 5px;
  border-radius: 5px;
  box-shadow: 2px 2px 10px 2px rgba(0,0,0,.3);
  box-sizing: border-box;
}

/* (optioneel maar handig) zorg dat hij niet uitrekt in hoogte */
.blok { align-self: flex-start; }

.blok .datum-onderwerp {
  height: 2.4em;
  line-height: 1.2em;
  margin-bottom: 10px;
  font-weight: bold;
  background-color: #2980B9;
  color: #FFF;
  padding: 5px;
  border-radius: 5px;
}

.blok .titel {
  font-family: Arial, sans-serif;
  color: #FF0000;
  font-size: 17px;
  margin-top: 10px;
  padding-left: 0;
}

.blok a {
  text-decoration: none;
  font-weight: bold;
  color: #009dd1;
}

.blok .middle-section a{
  display: block;
}

.blok img {
  width: 100%;
  height: auto;
  max-height: 300px;
  display: block;
  margin: 0;
  box-sizing: border-box;
}