.mischrechner,
.nikotinshot {
    width: 380px;
}

form {
    display: flex;
    flex-wrap: wrap;
}

h3 {
    text-align: center;
}

label {
    display: inline-block;
    width: 180px;
    text-align: right;
    line-height: 2rem;
}

input {
    width: 180px;
}

.break {
    flex-basis: 100%;
    height: 0;
}

button {
    flex-wrap: wrap;
    margin-top: 2rem;
    margin-left: 1rem;
}