style.css

html{
	height: 100%;
/*	background-image: linear-gradient(#ff6161, #ff768c);*/
	background-repeat: no-repeat;
	font-family: sans-serif;

	background-size: auto;
  background-color: #0f222d;
}

.main{
	width: 400px;
	display: flex;
	justify-content: center;
	flex-direction: column;
	margin: auto;
}
h1{
	text-align: center;
	color: #ff6161;
}
form{
	background-color: #fff;
	padding: 15px;
}
input[type="text"]{
	width:310px;
	height: 30px;
	outline: 0;
	border: none;
	font-size: 1.5em;
background-color: : #fff;
color: #2f4f4f ;
}
button{
	font-size: 1.5em;
	color: #53BDFF;
background-color: #ff768c
	outline: 0;
	border: 0px;
	width: 50px;
}
.tasksBoard{
  background-color: #fff;
  margin-top: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
  padding-right: 40px;
  display: none;
}
ul{
  list-style: none;
}
li{
  border-bottom: 1px solid #53BDFF;
  padding-bottom: 15px;
  padding-top: 15px;
  font-size: 1.3em;
  color: #53BDFF;
}
a{
  float: right;
  text-align: right;
  color: #fff;
  font-size: 1.2em;
  cursor: pointer;
}
.delete{
  background-color: #ff6161;
  padding: 0px 3px 0px 3px;
  color: #fff;
  cursor: pointer;
}
@media (max-width: 500px) {
  .main{
    margin: auto;
    width: 100%;
  }
  input[type="text"]{
    width: 80%;
  }
  button{
    width: 0%;
  }
}