style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');

* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  align-items: center;
  font-size: 20px;
  height: 100%;
  margin: 0;
  background-color: rgb(235, 206, 196);
  background-image: url(./img/background_office.jpg);
  background-size: 150vh;
}

header {
  text-align: center;
  font-family: 'Roboto';
  color: rgb(22, 22, 22);
  margin-top: 10px;
  opacity: 0.6;
}

.container {
  display: flex;
}

.column {
  height: 80vh;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.head {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: rgb(240, 219, 212);
  color: rgb(91, 143, 143);
}

.column,
.head,
.taskcontainer {
  border-radius: 10px;
  padding: 5px;
  margin: 5px;
}

.btn {
  width: 100px;
  height: 20px;
  border-radius: 5px;
  border: none;
  color: inherit;
  background: none;
  cursor: pointer;
}

.btn:hover {
  color: rgb(170, 184, 184);
}

h2 {
  margin: 5px;
}

.taskcontainer {
  flex: 2;
  flex-direction: column;
  justify-content: center;
}

.newtask {
  color: rgb(22, 22, 22);
  height: 100px;
  width: 29vw;
  border-radius: 10px;
  opacity: 0.7;
  text-align: center;
  margin: 5px;
  resize: none;
  overflow: auto;
  background-color: rgb(137, 151, 139);
  border: 1px solid #999;
  font-size: 12pt;
  
}

.draggable {
  padding: 1rem;
  cursor: grab;
}

.draggable.dragging {
  opacity: 0.2;
  cursor: grabbing;
}

textarea:active {
  outline-style: double;
  outline-color: rgb(240, 219, 212);
}

textarea:hover {
  box-shadow: 0 0 30px rgb(240, 219, 212);
  transition: 0.3s ease-in-out;
}

textarea:focus {
  outline-style: double;
  outline-color: rgb(240, 219, 212);
  box-shadow: 0 0 30px rgb(240, 219, 212);
  background-color: rgb(137, 155, 139);
  transition: 0.4s ease-in;
  cursor: text
}