Classe do botão não está presente no scss do formulário necessário corrigir o código no git:
.novaTarefa {
display: flex;
flex-direction: column;
grid-area: nova-tarefa;
background-color: #7687a1;
border-radius: 10px;
box-shadow: 2px 4px 4px #0000009f;
padding: 12px;
.inputContainer {
display: flex;
flex-direction: column;
width: 100%;
margin-bottom: 16px;
label {
margin-bottom: 8px;
font-size: 1.25rem;
}
input {
width: 100%;
padding: 8px 12px 4px;
box-sizing: border-box;
border: unset;
border-radius: 5px;
background-color: #5d677c;
box-shadow: 0px 2px 4px #2d2b2b9f inset;
&::placeholder {
color: #bfbfbf;
}
}
}
@media screen and (min-width: 1280px) {
flex-direction: row;
flex-wrap: wrap;
justify-content: space-around;
font-size: 2.25rem;
padding: 24px;
box-sizing: border-box;
.inputContainer {
width: calc(60% - 12px);
&:last-of-type {
width: 40%;
}
label {
font-size: 2rem;
}
input {
height: 100%;
font-size: 1.75rem;
}
}
button {
grid-column-start: span 2;
justify-self: center;
width: 200px;
font-size: 2.25rem;
}
}
}