body{
    display: flex;
    text-align: center;
    flex-wrap: wrap;
    transition: background-color 1s cubic-bezier(0.075, 0.82, 0.165, 1);
    align-items: top;
    margin: 0;
    font-family: "Roboto", sans-serif;
    font-size: 14px;
}
#container{
    max-width: 1000px;
    margin:0 auto;
}
header{
    padding: 3rem;
}
header > p {
    font-size: 1.3rem;
    font-weight: 200;
}
h1 {
    font-family: "Fredoka One", sans-serif;
    font-weight: bold;
    font-size: 2rem;
}
#app {
    flex: 1;
    text-align: center;
}
#app h1{
    padding: 4rem 0;
    font-size: 9rem;
    line-height: 180px;
    color: #cad0d6;
    margin: 0 0 20px;
    transition: all 0.8s cubic-bezier(0.445, 0.05, 0.55, 0.95);
    position: relative;
}
#app h1 span.letter{
    display: inline-block;
    transition: all 0.1s cubic-bezier(0.445, 0.05, 0.55, 0.95);
    min-width: 0.3em;
}
.error{
    transform: scale(1.2);
}
.success{
    transform: rotate(360deg);
}
.btn{
    padding: 10px 20px;
    background: rgb(241, 79, 79);
    border: none;
    font-size: 18px;
    cursor: pointer;
    border-radius: 30px;
    color: #FFF;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
    outline: none;
    box-shadow: 0px 8px 8px rgba(0, 0, 0, 0.152);
    transition: all .2s cubic-bezier(0.165, 0.84, 0.44, 1);
    opacity: 0.7;
    border: 2px solid rgb(241, 79, 79);
}
.btn:hover{
    transform: translateY( -5px );
    box-shadow: 0px 10px 12px rgba(0, 0, 0, 0.15);
    opacity: 1;
}
.btn:active{
    transform: translateY( 0 );
    box-shadow: 0px 3px 3px rgba(0, 0, 0, 0.15);
}
.items{
    text-align: center;
    margin: 1rem;
    padding: 3rem;
    background-color: #F1F1F1;
    border-radius: 30px;
}
.avatar{
    width: 150px;
    height: 150px;
    display: inline-block;
    margin: 10px;
    border-radius: 50%;
    overflow: hidden;
    background-color: #E0E0E0;
    background-size: cover;
    border: 1px solid #F0F0F0;
    cursor: pointer;
}